gpu: Fix Z offset for D3D12 realigned 3D texture uploads #1183

Job	Run time
Create test plan	4s
level1 / Haiku	1m 46s
level2 / iOS (CMake & xcode)	1m 52s
level2 / MacOS (GNU prefix)	3m 18s
level2 / Android (Android.mk)	1m 10s
level2 / Windows (msys2, ucrt64)	4m 35s
level2 / MacOS (Framework) (arm64)	2m 24s
level2 / Windows (MSVC, ARM64)	4m 11s
level2 / Android (Gradle)	2m 29s
level2 / LoongArch64	3m 21s
level2 / Ubuntu 24.04 (ARM64)	6m 28s
level2 / Windows (MSVC, clang-cl x64)	4m 44s
level2 / RISC OS	1m 24s
level2 / GDK (MSVC, x64)	3m 0s
level2 / Nintendo 3DS	1m 48s
level2 / Emscripten	9m 22s
level2 / FreeBSD	2m 47s
level2 / Steam Linux Runtime (Sniper)	2m 55s
level2 / Ubuntu 22.04	2m 36s
level2 / Android (CMake, lean)	1m 54s
level2 / Ubuntu 22.04 (Intel Compiler)	3m 42s
level2 / Windows (MSVC, ARM)	4m 16s
level2 / PowerPC	2m 8s
level2 / NetBSD	3m 52s
level2 / Windows (MSVC, x86)	6m 21s
level2 / Android (CMake)	2m 47s
level2 / PowerPC64	1m 56s
level2 / Windows (msys2, clang64)	4m 23s
level2 / Ubuntu 22.04 (Intel oneAPI)	4m 26s
level2 / Sony PlayStation 2	4m 47s
level2 / tvOS (CMake & xcode)	1m 53s
level2 / Sony PlayStation Vita (GLES w/ pib)	2m 40s
level2 / MacOS (Framework) (x64)	7m 55s
level2 / Sony PlayStation Portable	3m 46s
level2 / Windows (MSVC, x64)	6m 25s
level2 / Windows (msys2, mingw64)	4m 28s
level2 / Windows (msys2, mingw32)	5m 24s
level2 / Sony PlayStation Vita (GLES w/ PVR_PSP2)	2m 50s
level2 / Windows (MSVC, clang-cl x86)	6m 52s
	2h 22m 59s

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