[idd] capture: preserve software copy row pitch

Use an explicit placed buffer for software frame copies so the D3D copy
uses the same row pitch published through KVMFR.

GetCopyableFootprints describes buffer copies and cannot be used to infer
the physical layout of a placed row-major texture. This caused padded
resolutions to use the wrong row starts in every consumer.

Keep the copy direct to IVSHMEM without a staging or CPU copy.

idd/LGIdd/capture/CSoftwareFrameProcessor.h

@@ -25,8 +25,6 @@
 class CSoftwareFrameProcessor final : public CFrameProcessor
 {
 private:
-  bool m_directTexture;
-
   static void CompletionFunction(
     CD3D12CommandSlot * slot, bool result, void * param1, void * param2);