Custom steering wheel icons

Added toggle for custom steering wheel icons in the onroad UI.

Want to add your own steering wheel? Request one under "feature-requests" on the FrogPilot Discord!

selfdrive/ui/ui.cc

@@ -294,6 +294,7 @@ void ui_update_params(UIState *s) {
   scene.unlimited_road_ui_length = scene.model_ui && params.getBool("UnlimitedLength");
 
   scene.screen_brightness = params.getInt("ScreenBrightness");
+  scene.wheel_icon = params.getInt("WheelIcon");
 }
 
 void UIState::updateStatus() {