Update ultralcd.cpp

Fix number of nozzle displayed in temperature menu.

Marlin/ultralcd.cpp

 #if TEMP_SENSOR_0 != 0
   MENU_ITEM_EDIT(int3, MSG_NOZZLE, &target_temperature[0], 0, HEATER_0_MAXTEMP - 15);
 #endif
-#if TEMP_SENSOR_1 != 0
+#if TEMP_SENSOR_1 != 0 && EXTRUDERS > 1
   MENU_ITEM_EDIT(int3, MSG_NOZZLE " 2", &target_temperature[1], 0, HEATER_1_MAXTEMP - 15);
 #endif
-#if TEMP_SENSOR_2 != 0
+#if TEMP_SENSOR_2 != 0 && EXTRUDERS > 2
   MENU_ITEM_EDIT(int3, MSG_NOZZLE " 3", &target_temperature[2], 0, HEATER_2_MAXTEMP - 15);
 #endif
-#if TEMP_SENSOR_3 != 0
+#if TEMP_SENSOR_3 != 0 && EXTRUDERS > 3
   MENU_ITEM_EDIT(int3, MSG_NOZZLE " 4", &target_temperature[3], 0, HEATER_3_MAXTEMP - 15);
 #endif
 #if TEMP_SENSOR_BED != 0