Fix compilation error when PIDTEMP is undefined and ULTIPANEL is defined.

Marlin/ultralcd.pde

@@ -1181,6 +1181,7 @@ void MainMenu::showControlTemp()
         }
         
       }break;
+      	#ifdef PIDTEMP
       case ItemCT_PID_P: 
       {
       if(force_lcd_update)
@@ -1324,6 +1325,7 @@ void MainMenu::showControlTemp()
         
       }
       	#endif
+      #endif
       break;
     default:   
       break;