[Bug] Fix RGB/LED Matrix Suspend code (#14084)

quantum/rgb_matrix/rgb_matrix.c

@@ -501,8 +501,9 @@ void rgb_matrix_init(void) {
 
 void rgb_matrix_set_suspend_state(bool state) {
 #ifdef RGB_DISABLE_WHEN_USB_SUSPENDED
-    if (state) {
-        rgb_matrix_set_color_all(0, 0, 0);  // turn off all LEDs when suspending
+    if (state && !suspend_state) {  // only run if turning off, and only once
+        rgb_task_render(0);         // turn off all LEDs when suspending
+        rgb_task_flush(0);          // and actually flash led state to LEDs
     }
     suspend_state = state;
 #endif