Fix framebuffer created for reflection probe in mobile renderer #20516

Job	Run time
📊 Static checks / Code style, file formatting, and docs	37s
🐧 Linux / Editor w/ Mono (target=editor)	5m 4s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	17m 8s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	6m 8s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	6m 27s
🍎 macOS / Editor (target=editor, tests=yes)	4m 31s
🐧 Linux / Template w/ Mono (target=template_release)	1m 38s
🍏 iOS / Template (target=template_release)	2m 29s
🍎 macOS / Template (target=template_release)	4m 22s
🐧 Linux / Minimal template (target=template_release, everything disabled)	1m 26s
🤖 Android / Template (target=template_release)	4m 11s
🏁 Windows / Editor (target=editor, tests=yes)	9m 0s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	1m 21s
🏁 Windows / Template (target=template_release)	7m 34s
🌐 Web / Template w/o threads (target=template_release, threads=no)	1m 9s
🪲 Godot CPP / Build and test Godot CPP	6m 54s
	1h 19m 59s

Provide feedback