rgb_matrix: continue calling rgb_matrix_indicators() when toggled off

This allows user code to continue to use the matrix for indication, even
when the RGB toggle is off, using rgb_matrix_set_color().

Without this change, it's impossible for user code to use the matrix
when the toggle is off, as any changes get overwritten with black on the
next task cycle, and the indicator code is not called at all.

quantum/rgb_matrix.c

@@ -620,7 +620,8 @@ void rgb_matrix_custom(void) {
 void rgb_matrix_task(void) {
     static uint8_t toggle_enable_last = 255;
 	if (!rgb_matrix_config.enable) {
-    	rgb_matrix_all_off();
+        rgb_matrix_all_off();
+        rgb_matrix_indicators();
         toggle_enable_last = rgb_matrix_config.enable;
     	return;
     }