ui: update DM icon at every frame (#28226)

selfdrive/ui/qt/onroad.cc

@@ -281,14 +281,12 @@ void AnnotatedCameraWidget::updateState(const UIState &s) {
   // update engageability/experimental mode button
   experimental_btn->updateState(s);
 
-  // update DM icons at 2Hz
-  if (sm.frame % (UI_FREQ / 2) == 0) {
-    setProperty("dmActive", sm["driverMonitoringState"].getDriverMonitoringState().getIsActiveMode());
-    setProperty("rightHandDM", sm["driverMonitoringState"].getDriverMonitoringState().getIsRHD());
-  }
-
+  // update DM icon
+  auto dm_state = sm["driverMonitoringState"].getDriverMonitoringState();
+  setProperty("dmActive", dm_state.getIsActiveMode());
+  setProperty("rightHandDM", dm_state.getIsRHD());
   // DM icon transition
-  dm_fade_state = fmax(0.0, fmin(1.0, dm_fade_state+0.2*(0.5-(float)(dmActive))));
+  dm_fade_state = std::clamp(dm_fade_state+0.2*(0.5-dmActive), 0.0, 1.0);
 }
 
 void AnnotatedCameraWidget::drawHud(QPainter &p) {