[UI/GPU] Fix include order

src/xenia/ui/d3d12/d3d12_context.h

@@ -14,7 +14,7 @@
 
 #include "xenia/ui/d3d12/command_list.h"
 #include "xenia/ui/d3d12/cpu_fence.h"
-#include "xenia/ui/d3d12/d3d12_api.h"
+#include "xenia/ui/d3d12/d3d12_immediate_drawer.h"
 #include "xenia/ui/d3d12/d3d12_provider.h"
 #include "xenia/ui/graphics_context.h"
 
@@ -24,8 +24,6 @@ namespace xe {
 namespace ui {
 namespace d3d12 {
 
-class D3D12ImmediateDrawer;
-
 class D3D12Context : public GraphicsContext {
  public:
   ~D3D12Context() override;