fix(FrameAnnotations): correct vr100 depth-buffer label

[alandtse]

The VR-only DepthBuffer4xDownscale pass (VR ImageSpaceEffect index 100) was annotated with the enum ISCopyDepthBuffer_DR (index 99) — a copy-paste duplicate, so its Render/Dispatch perf events showed the wrong (duplicate) name in captures.

VR index 100 is ISCopyDepthBufferTargetSize, verified against the engine effect-init dispatcher (SkyrimVR.exe ImageSpaceManager init → register helper, index in EDX). Fixed both the Render (vfunc 0x1) and Dispatch (vfunc 0xC) hooks for VTABLE_BSImagespaceShaderDepthBuffer4xDownscale.

Audited all 278 enum/VTABLE annotation pairs — no other mismatches (ISCopyGrayScale/GreyScale is the same shader, gray/grey spelling).

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• src/FrameAnnotations.cpp

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[github-actions]

No actionable suggestions for changed features.

[Copilot]

Pull request overview

Fixes an incorrect frame-annotation label for a VR-only image-space depth pass so GPU/CPU perf capture event names correctly reflect the underlying ImageSpaceEffect index.

Changes:

• Corrects the BSImagespaceShaderDepthBuffer4xDownscale Render hook annotation from ISCopyDepthBuffer_DR to ISCopyDepthBufferTargetSize.
• Corrects the BSImagespaceShaderDepthBuffer4xDownscale Dispatch hook annotation from ISCopyDepthBuffer_DR to ISCopyDepthBufferTargetSize.

[github-actions]

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