Fixed Frame dumping in VideoSoftware.

Old code dumped the efb, which was no-longer relevant since the
backend gained xfb support.
New code dumps the colour texture which is about to be rendered to
the screen so correctly reflects the bypassXFB option.

Source/Core/VideoBackends/Software/DebugUtil.h

@@ -16,7 +16,7 @@ namespace DebugUtil
 	void OnObjectBegin();
 	void OnObjectEnd();
 
-	void OnFrameEnd();
+	void OnFrameEnd(u32 width, u32 height);
 
 	void DrawObjectBuffer(s16 x, s16 y, u8 *color, int bufferBase, int subBuffer, const char *name);