Remove additional directory path.

[krypton36]

Remove extra directory path in chip-cert-bins Docker image.

[github-actions]

PR #25772: Size comparison from 2a9fa2a to 1ec3ddc

Full report (1 build for cc32xx)

platform	target	config	section	2a9fa2a	1ec3ddc	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	645601	645601	0	0.0
			(read/write)	203848	203848	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197248	197248	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	930292	930292	0	0.0
			.debug_aranges	87400	87400	0	0.0
			.debug_frame	300320	300320	0	0.0
			.debug_info	20248022	20248022	0	0.0
			.debug_line	2661345	2661345	0	0.0
			.debug_loc	2805489	2805489	0	0.0
			.debug_ranges	283264	283264	0	0.0
			.debug_str	3027174	3027174	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105993	105993	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	380421	380421	0	0.0
			.symtab	257408	257408	0	0.0
			.text	537488	537488	0	0.0

[raju-apple]

Tried out the change as well and the script runs successfully.