Fix build warning with memset value being too large #19612

Job	Run time
📊 Static checks / Code style, file formatting, and docs	45s
🐧 Linux / Editor w/ Mono (target=editor)	5m 13s
🐧 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)	16m 38s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	7m 40s
🤖 Android / Template (target=template_release)	27m 41s
🍎 macOS / Editor (target=editor, tests=yes)	9m 54s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	6m 31s
🍎 macOS / Template (target=template_release)	3m 35s
🍏 iOS / Template (target=template_release)	3m 51s
🐧 Linux / Template w/ Mono (target=template_release)	2m 2s
🌐 Web / Template (target=template_release)	2m 59s
🐧 Linux / Minimal template (target=template_release, everything disabled)	2m 6s
🏁 Windows / Editor (target=editor, tests=yes)	9m 11s
🏁 Windows / Template (target=template_release)	29m 10s
🪲 Godot CPP / Build and test Godot CPP	6m 42s
	2h 13m 58s

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