GPU: Fix D3D12_INTERNAL_StrToWStr returning the wrong length #920

Job	Run time
Create test plan	8s
level1 / Haiku	2m 2s
level2 / Ubuntu 20.04 (Intel Compiler)	2m 56s
level2 / tvOS (CMake & xcode)	2m 14s
level2 / FreeBSD	2m 52s
level2 / Nintendo 3DS	1m 59s
level2 / Steam Linux Runtime (Sniper)	2m 56s
level2 / MacOS (Framework) (arm64)	2m 18s
level2 / Android (CMake, lean)	2m 54s
level2 / PowerPC	1m 46s
level2 / Sony PlayStation 2	4m 49s
level2 / RISC OS	1m 24s
level2 / iOS (CMake & xcode)	1m 58s
level2 / PowerPC64	1m 53s
level2 / Ubuntu 20.04 (Intel oneAPI)	2m 55s
level2 / MacOS (GNU prefix)	3m 0s
level2 / Windows (msys2, mingw32)	53s
level2 / Emscripten	5m 2s
level2 / Windows (MSVC, x64)	1m 53s
level2 / Windows (MSVC, ARM)	3m 12s
level2 / Android (Android.mk)	1m 9s
level2 / LoongArch64	2m 53s
level2 / Sony PlayStation Vita (GLES w/ pib)	3m 13s
level2 / Windows (msys2, clang32)	1m 45s
level2 / Windows (MSVC, clang-cl x86)	1m 56s
level2 / GDK (MSVC, x64)	2m 59s
level2 / Ubuntu 20.04	2m 38s
level2 / Windows (msys2, clang64)	1m 32s
level2 / Windows (MSVC, ARM64)	1m 42s
level2 / Android (Gradle)	2m 26s
level2 / Ubuntu 22.04	2m 28s
level2 / MacOS (Framework) (x64)	5m 3s
level2 / Sony PlayStation Vita (GLES w/ PVR_PSP2)	3m 14s
level2 / Windows (MSVC, x86)	1m 47s
level2 / Windows (msys2, mingw64)	19s
level2 / Sony PlayStation Portable	3m 45s
level2 / Windows (MSVC, clang-cl x64)	2m 1s
level2 / NetBSD	2m 28s
level2 / Windows (msys2, ucrt64)	21s
level2 / Android (CMake)	2m 48s
	1h 35m 31s

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