fix(开鲁水查查)：购水量

shuichacha-for-KL/pages/payment/payment.wxml

@@ -43,7 +43,7 @@
   </view>
   <view class="volume">
     <view class="box">
-      <view class="title line">用水量</view>
+      <view class="title line">购水量</view>
       <view class="input">
         <image class="shuidi" src="/static/img/icon_shuidi.png"></image>
         <input type="number" maxlength="4" value="{{volume}}" bindinput="setAmount" placeholder="{{amountTip}}"