🚸 Fix MKS LVGL UI temperature set interface (#22848, #22842)

Marlin/src/lcd/extui/mks_ui/draw_preHeat.cpp

@@ -124,24 +124,18 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
         else if (uiCfg.extruderIndex == 0) {
           uiCfg.curTempType = TERN(HAS_HEATED_BED, 1, 0);
         }
+        lv_obj_del(btn_pla);
+        lv_obj_del(btn_abs);
       }
       else if (uiCfg.curTempType == 1) {
         uiCfg.extruderIndex = 0;
         uiCfg.curTempType = 0;
-        disp_add_dec();
-        disp_ext_heart();
+        lv_obj_del(buttonAdd);
+        lv_obj_del(buttonDec);
       }
+
       disp_temp_type();
       break;
-    case ID_P_STEP:
-      switch (uiCfg.stepHeat) {
-        case  1: uiCfg.stepHeat =  5; break;
-        case  5: uiCfg.stepHeat = 10; break;
-        case 10: uiCfg.stepHeat =  1; break;
-        default: break;
-      }
-      disp_step_heat();
-      break;
     case ID_P_OFF:
       if (uiCfg.curTempType == 0) {
         thermalManager.setTargetHotend(0, uiCfg.extruderIndex);
@@ -160,10 +154,16 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
       draw_return_ui();
       break;
     case ID_P_ABS:
+      if (uiCfg.curTempType == 0)
         thermalManager.setTargetHotend(PREHEAT_2_TEMP_HOTEND, 0);
+      else if (uiCfg.curTempType == 1)
+        thermalManager.setTargetBed(PREHEAT_2_TEMP_BED);
       break;
     case ID_P_PLA:
+      if (uiCfg.curTempType == 0)
         thermalManager.setTargetHotend(PREHEAT_1_TEMP_HOTEND, 0);
+      else if (uiCfg.curTempType == 1)
+        thermalManager.setTargetBed(PREHEAT_1_TEMP_BED);
       break;
   }
 }
@@ -184,6 +184,7 @@ void lv_draw_preHeat() {
   buttonStep = lv_imgbtn_create(scr, nullptr, BTN_X_PIXEL + INTERVAL_V * 2, BTN_Y_PIXEL + INTERVAL_H + titleHeight, event_handler, ID_P_STEP);
 
   if (uiCfg.curTempType == 0) disp_ext_heart();
+  if (uiCfg.curTempType == 1) disp_ext_heart();
 
   #if HAS_ROTARY_ENCODER
     if (gCfgItems.encoder_enable) {

Marlin/src/lcd/extui/mks_ui/draw_ready_print.cpp

@@ -98,6 +98,7 @@ void disp_det_ok() {
   lv_obj_set_style(det_info, &det_style);
   lv_label_set_text(det_info, "det:ok");
 }
+
 void disp_det_error() {
   det_style.text.color.full = 0xF800;
   lv_obj_set_style(det_info, &det_style);