pbio/sys/light_matrix: Disable animation for EV3.

Having the light matrix for the UI is useful for now, but we don't need the animation, which gets in the way of other developments.

The hub light serves as an indicator that the program is running.

Author: laurensvalk

lib/pbio/sys/light_matrix.c

@@ -158,6 +158,13 @@ static uint32_t pbsys_hub_light_matrix_user_program_animation_next(pbio_light_an
  * @param start   @c true for start or @c false for stop.
  */
 void pbsys_hub_light_matrix_handle_user_program_start(bool start) {
+
+    #if PBSYS_CONFIG_HUB_LIGHT_MATRIX_DISPLAY
+    pbio_image_fill(pbdrv_display_get_image(), 0);
+    pbdrv_display_update();
+    return;
+    #endif
+
     if (start) {
         // The user animation updates only a subset of pixels to save time,
         // so the rest must be cleared before it starts.