[Core] RGB Matrix limit basic indicators to the last render (#21169)

Co-authored-by: Joel Challis <[email protected]>

quantum/led_matrix/led_matrix.c

@@ -366,7 +366,10 @@ void led_matrix_task(void) {
         case RENDERING:
             led_task_render(effect);
             if (effect) {
-                led_matrix_indicators();
+                // Only run the basic indicators in the last render iteration (default there are 5 iterations)
+                if (led_effect_params.iter == LED_MATRIX_LED_PROCESS_MAX_ITERATIONS) {
+                    led_matrix_indicators();
+                }
                 led_matrix_indicators_advanced(&led_effect_params);
             }
             break;