Enclosed error-messages for TEMP_SENSOR_1_AS_REDUNDANT in PSTR()

Marlin/temperature.cpp

     #ifdef TEMP_SENSOR_1_AS_REDUNDANT
       if (fabs(current_temperature[0] - redundant_temperature) > MAX_REDUNDANT_TEMP_SENSOR_DIFF) {
         disable_heater();
-        _temp_error(-1, MSG_EXTRUDER_SWITCHED_OFF, MSG_ERR_REDUNDANT_TEMP);
+        _temp_error(0, PSTR(MSG_EXTRUDER_SWITCHED_OFF), PSTR(MSG_ERR_REDUNDANT_TEMP));
       }
     #endif //TEMP_SENSOR_1_AS_REDUNDANT