Fix sprintf type issue in TlvJson

[mrjerryjohns]

Problem

Builds on MbedOS are failing due to mismatched type in a sprintf call inside TlvJson.cpp.

[woody-apple]

Approving pending CI

[woody-apple]

Note: This build has failed in master, but not on a PR due to limited coverage of PRs on this platform. Suggest reverting to previous behavior.

[github-actions]

PR #15772: Size comparison from 1fd382d to 87dacd6

Full report (19 builds for cyw30739, efr32, esp32, k32w, linux, p6, qpg, telink)

platform	target	config	section	1fd382d	87dacd6	change	% change
cyw30739	light	cyw930739m2evb_01	(read/write)	600618	600618	0	0.0
			.app_xip_area	505392	505392	0	0.0
			.bss	77908	77908	0	0.0
			.data	660	660	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	lock	cyw930739m2evb_01	(read/write)	558614	558614	0	0.0
			.app_xip_area	464924	464924	0	0.0
			.bss	76412	76412	0	0.0
			.data	624	624	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	ota-requestor	cyw930739m2evb_01	(read/write)	579394	579394	0	0.0
			.app_xip_area	476008	476008	0	0.0
			.bss	85780	85780	0	0.0
			.data	568	568	0	0.0
			.rodata	0	0	0	0.0
			.text	112	112	0	0.0
efr32	lighting-app	BRD4161A	(read only)	917996	917996	0	0.0
			(read/write)	128936	128936	0	0.0
			.bss	126880	126880	0	0.0
			.data	2056	2056	0	0.0
			.text	917988	917988	0	0.0
		BRD4161A+rpc	(read only)	948072	948072	0	0.0
			(read/write)	145880	145880	0	0.0
			.bss	143656	143656	0	0.0
			.data	2220	2220	0	0.0
			.text	948064	948064	0	0.0
	lock-app	BRD4161A+wf200	(read only)	987676	987676	0	0.0
			(read/write)	120432	120432	0	0.0
			.bss	118500	118500	0	0.0
			.data	1932	1932	0	0.0
			.text	987668	987668	0	0.0
	window-app	BRD4161A	(read only)	852396	852396	0	0.0
			(read/write)	126908	126908	0	0.0
			.bss	124984	124984	0	0.0
			.data	1924	1924	0	0.0
			.text	852388	852388	0	0.0
esp32	all-clusters-app	m5stack	(read only)	1008323	1008323	0	0.0
			(read/write)	459980	459980	0	0.0
			.dram0.bss	68184	68184	0	0.0
			.dram0.data	34080	34080	0	0.0
			.flash.rodata	225880	225880	0	0.0
			.flash.text	1002939	1002939	0	0.0
			.iram0.text	123107	123107	0	0.0
k32w	light	k32w061+release	(read/write)	693200	693200	0	0.0
			.bss	77808	77808	0	0.0
			.data	1932	1932	0	0.0
			.text	607660	607660	0	0.0
	lock	k32w061+release	(read/write)	696200	696200	0	0.0
			.bss	77744	77744	0	0.0
			.data	1972	1972	0	0.0
			.text	610684	610684	0	0.0
linux	chip-tool-ipv6only	arm64	(read only)	9045876	9045876	0	0.0
			(read/write)	401521	401521	0	0.0
			.bss	43745	43745	0	0.0
			.data	1192	1192	0	0.0
			.data.rel.ro	300984	300984	0	0.0
			.dynamic	560	560	0	0.0
			.got	51816	51816	0	0.0
			.init	24	24	0	0.0
			.init_array	192	192	0	0.0
			.rodata	473100	473100	0	0.0
			.text	7694196	7694196	0	0.0
	thermostat-no-ble	arm64	(read only)	2169572	2169572	0	0.0
			(read/write)	148625	148625	0	0.0
			.bss	65345	65345	0	0.0
			.data	1072	1072	0	0.0
			.data.rel.ro	75032	75032	0	0.0
			.dynamic	560	560	0	0.0
			.got	4216	4216	0	0.0
			.init	24	24	0	0.0
			.init_array	352	352	0	0.0
			.rodata	132996	132996	0	0.0
			.text	1818352	1818352	0	0.0
p6	all-clusters-app	default	(read/write)	2489552	2489552	0	0.0
			.bss	118736	118736	0	0.0
			.data	2696	2696	0	0.0
			.text	1447816	1447816	0	0.0
	light-app	default	(read/write)	2396728	2396728	0	0.0
			.bss	113048	113048	0	0.0
			.data	2544	2544	0	0.0
			.text	1354992	1354992	0	0.0
	lock-app	default	(read/write)	2360240	2360240	0	0.0
			.bss	112792	112792	0	0.0
			.data	2504	2504	0	0.0
			.text	1318504	1318504	0	0.0
qpg	lighting-app	qpg6105+debug	(read only)	602284	602284	0	0.0
			(read/write)	146936	146936	0	0.0
			.bss	91192	91192	0	0.0
			.data	1132	1132	0	0.0
			.text	596964	596964	0	0.0
	lock-app	qpg6105+debug	(read only)	567984	567984	0	0.0
			(read/write)	146936	146936	0	0.0
			.bss	91200	91200	0	0.0
			.data	1084	1084	0	0.0
			.text	562664	562664	0	0.0
	persistent-storage-app	qpg6105+debug	(read only)	99520	99520	0	0.0
			(read/write)	146940	146940	0	0.0
			.bss	24004	24004	0	0.0
			.data	176	176	0	0.0
			.text	94200	94200	0	0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	884222	884222	0	0.0
			bss	86408	86408	0	0.0
			noinit	37160	37160	0	0.0
			text	625174	625174	0	0.0