fix(DateTimePicker): fix console warning (#4126)

Author: anlyyao

packages/components/date-time-picker/date-time-picker.wxml

@@ -22,6 +22,7 @@
     wx:for="{{columns}}"
     wx:key="index"
     class="{{_.cls(classPrefix + '__item', [['roomly', columns.length >= 5 && index == 0]])}}"
+    use-slots="{{false}}"
     options="{{item}}"
     index="index"
     format="{{formatter}}"

packages/components/picker-item/picker-item.ts

@@ -51,7 +51,13 @@ export default class PickerItem extends SuperComponent {
 
   externalClasses = [`${prefix}-class`];
 
-  properties = props;
+  properties = {
+    ...props,
+    useSlots: {
+      type: Boolean,
+      value: true,
+    },
+  };
 
   observers = {
     'options, keys'() {

packages/components/picker-item/picker-item.wxml

@@ -27,7 +27,7 @@
         >
           <t-icon wx:if="{{option[keys.icon]}}" class="{{classPrefix}}__item-icon" name="{{option[keys.icon]}}" />
           <text class="{{classPrefix}}__item-label">{{option[keys.label]}}</text>
-          <slot name="label-suffix--{{virtualStartIndex + index}}"></slot>
+          <slot wx:if="{{useSlots}}" name="label-suffix--{{virtualStartIndex + index}}"></slot>
         </view>
       </view>
     </view>
@@ -45,7 +45,7 @@
       >
         <t-icon wx:if="{{option[keys.icon]}}" class="{{classPrefix}}__item-icon" name="{{option[keys.icon]}}" />
         <text class="{{classPrefix}}__item-label">{{option[keys.label]}}</text>
-        <slot name="label-suffix--{{index}}"></slot>
+        <slot wx:if="{{useSlots}}" name="label-suffix--{{index}}"></slot>
       </view>
     </block>
   </view>