LCD status changed

When the lcd status changed it will be printed "LCD status changed" to serial line.

Firmware/ultralcd.cpp

@@ -8968,6 +8968,7 @@ void lcd_ignore_click(bool b)
 }
 
 void lcd_finishstatus() {
+  SERIAL_PROTOCOLLN("LCD status changed");
   int len = strlen(lcd_status_message);
   if (len > 0) {
     while (len < LCD_WIDTH) {