ImGuiOverlays: Change icon colour depending on controller mode

src/core/controller.cpp

@@ -82,6 +82,11 @@ std::optional<u32> Controller::GetAnalogInputBytes() const
   return std::nullopt;
 }
 
+u32 Controller::GetInputOverlayIconColor() const
+{
+  return 0xFFFFFFFFu;
+}
+
 void Controller::LoadSettings(SettingsInterface& si, const char* section)
 {
 }