custom-tab-bar: 更换凹口图片，解决模糊问题

pages/template/custom-tab-bar/custom-tab-bar.uvue

@@ -18,7 +18,7 @@
         </view>
       </view>
       <view>
-        <image class="concave-image" src="/static/template/custom-tab-bar2/concave.png"></image>
+        <image class="concave-image" mode="heightFix" src="/static/template/custom-tab-bar/concave.png"></image>
         <view class="btn-plus" @click="onPlusClick">
           <text class="btn-plus-text">+</text>
         </view>
@@ -176,13 +176,12 @@
   }
 
   .concave-image {
-    width: 115px;
     height: 56px;
   }
 
   .btn-plus {
     position: absolute;
-    left: 23px;
+    left: 43px;
     width: 70px;
     height: 70px;
     border-radius: 50px;