[main] add delay between possible screen changes to make user button usable

Core/Src/main.c

@@ -239,6 +239,8 @@ int main(void)
 	  display_load(display_current_frame);
 
 	  while (1) {
+		  HAL_Delay(15);
+
 		  // go to next report
 		  if (UB || SWT1 || SWT5) {
 			  display_current_frame += 1;