Fix starting fan with bad material preset index (#19773)

Marlin/src/lcd/menu/menu_temperature.cpp

 //
 
 void Temperature::lcd_preheat(const int16_t e, const int8_t indh, const int8_t indb) {
+  UNUSED(e); UNUSED(indh); UNUSED(indb);
   #if HAS_HOTEND
     if (indh >= 0 && ui.material_preset[indh].hotend_temp > 0)
       setTargetHotend(_MIN(thermalManager.heater_maxtemp[e] - HOTEND_OVERSHOOT, ui.material_preset[indh].hotend_temp), e);
-  #else
-    UNUSED(e); UNUSED(indh);
   #endif
   #if HAS_HEATED_BED
     if (indb >= 0 && ui.material_preset[indb].bed_temp > 0) setTargetBed(ui.material_preset[indb].bed_temp);
-  #else
-    UNUSED(indb);
   #endif
   #if HAS_FAN
-    set_fan_speed((
-      #if FAN_COUNT > 1
-        active_extruder < FAN_COUNT ? active_extruder :
-      #endif
-      0), ui.material_preset[indh].fan_speed
-    );
+    if (indh >= 0)
+      set_fan_speed(active_extruder < (FAN_COUNT) ? active_extruder : 0, ui.material_preset[indh].fan_speed);
   #endif
   ui.return_to_status();
 }
 
   #endif
 
-  void do_preheat_end_m() { _preheat_end(editable.int8, 0); }
+  void do_preheat_end_m() {
+    _preheat_end(editable.int8, 0);
+  }
 
   #if HAS_MULTI_HOTEND || HAS_HEATED_BED