fix(t-step-item): 移除title和content多余的尖括号

Author: runoob-coder

src/step-item/step-item.wxml

@@ -30,12 +30,12 @@
   >
     <slot />
     <view class="{{_.cls(classPrefix + '__title', [curStatus, layout])}} {{prefix}}-class-title">
-      <block wx:if="{{title}}">{{ title }}></block>
+      <block wx:if="{{title}}">{{ title }}</block>
       <slot name="title" />
       <slot wx:if="{{layout === 'vertical'}}" name="title-right" />
     </view>
     <view class="{{_.cls(classPrefix + '__description', [layout])}} {{prefix}}-class-description">
-      <block wx:if="{{content}}">{{ content }}></block>
+      <block wx:if="{{content}}">{{ content }}</block>
       <slot name="content" />
     </view>
     <view class="{{_.cls(classPrefix + '__extra', [layout])}} {{prefix}}-class-extra">