yuzu/debugger: Remove graphics surface viewer

This doesn't actually work anymore, and given how long it's been left in
that state, it's unlikely anyone actually seriously used it.

Generally it's preferable to use RenderDoc or Nsight to view surfaces.

src/yuzu/main.h

@@ -23,7 +23,6 @@ class EmuThread;
 class GameList;
 class GImageInfo;
 class GraphicsBreakPointsWidget;
-class GraphicsSurfaceWidget;
 class GRenderWindow;
 class LoadingScreen;
 class MicroProfileDialog;
@@ -238,7 +237,6 @@ private:
     ProfilerWidget* profilerWidget;
     MicroProfileDialog* microProfileDialog;
     GraphicsBreakPointsWidget* graphicsBreakpointsWidget;
-    GraphicsSurfaceWidget* graphicsSurfaceWidget;
     WaitTreeWidget* waitTreeWidget;
 
     QAction* actions_recent_files[max_recent_files_item];