Fix huge .tscn icon and icon in background of File System panel #31671

Job	Run time
📊 Static checks / Code style, file formatting, and docs	1m 10s
🐧 Linux / Editor w/ Mono (target=editor)	39m 43s
🐧 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)	45m 22s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	35m 26s
🤖 Android / Template (target=template_release)	30m 15s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	29m 42s
🍎 macOS / Editor (target=editor, tests=yes)	29m 3s
🐧 Linux / Template w/ Mono (target=template_release)	24m 49s
🍎 macOS / Template (target=template_release)	20m 17s
🐧 Linux / Minimal template (target=template_release, everything disabled)	14m 54s
🍏 iOS / Template (target=template_release)	9m 6s
🏁 Windows / Editor (target=editor, tests=yes)	47m 53s
🏁 Windows / Template (target=template_release)	33m 49s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	26m 42s
🌐 Web / Template w/o threads (target=template_release, threads=no)	24m 26s
🪲 Godot CPP / Build and test Godot CPP	7m 49s
	7h 0m 26s

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