PFW-1542 Reset status line message on EFCE_OK

If the error is really resolved, I'd prefer to see

"Prusa i3 MK3S OK" instead of "Err:HOTEND FAN ERROR"

Firmware/fancheck.cpp

@@ -146,6 +146,7 @@ void checkFanSpeed()
     if ((fan_check_error == EFCE_FIXED) && !printer_active()){
         fan_check_error = EFCE_OK; //if the issue is fixed while the printer is doing nothing, reenable processing immediately.
         lcd_reset_alert_level(); //for another fan speed error
+        lcd_setstatuspgm(MSG_WELCOME); // Reset the status line message to visually show the error is gone
     }
     if (fans_check_enabled && (fan_check_error == EFCE_OK))
     {