fix(Calendar): renaming the class keyword (#3781)

Author: anlyyao

src/calendar/calendar-header.wxml

@@ -1,7 +1,7 @@
 <wxs src="../common/utils.wxs" module="_" />
 
 <template name="calendar-header">
-  <view class="{{class}} {{classPrefix}} {{switchMode !== 'none' ? classPrefix + '__with-action' : ''}}" id="{{tId}}">
+  <view class="{{tClass}} {{classPrefix}} {{switchMode !== 'none' ? classPrefix + '__with-action' : ''}}" id="{{tId}}">
     <view class="{{classPrefix}}__action" wx:if="{{switchMode !== 'none'}}">
       <view
         wx:if="{{switchMode === 'year-month'}}"

src/calendar/template.wxml

@@ -40,7 +40,7 @@
       <template
         wx:if="{{switchMode === 'none'}}"
         is="calendar-header"
-        data="{{class: classPrefix + '__month', classPrefix: classPrefix + '-header', tId: 'year_' + item.year + '_month_' + item.month, switchMode, ...actionButtons, title: _this.getMonthTitle(item.year, realLocalText.months[item.month], realLocalText.monthTitle) }}"
+        data="{{tClass: classPrefix + '__month', classPrefix: classPrefix + '-header', tId: 'year_' + item.year + '_month_' + item.month, switchMode, ...actionButtons, title: _this.getMonthTitle(item.year, realLocalText.months[item.month], realLocalText.monthTitle) }}"
       />
       <view class="{{classPrefix}}__dates">
         <view wx:for="{{(item.weekdayOfFirstDay - firstDayOfWeek + 7) % 7}}" wx:key="index" />