GPU/D3D11: Restore API state after updating settings

Should fix the debug layer warnings when adjusting resolution scale.

src/core/gpu_hw_d3d11.cpp

@@ -126,6 +126,7 @@ void GPU_HW_D3D11::UpdateSettings()
   CreateFramebuffer();
   CreateStateObjects();
   CompileShaders();
+  RestoreGraphicsAPIState();
   UpdateDisplay();
 }