feat(SCRM-7245): 移除多余符号

src/pages/parkingFeeV2/parkingFeeDetail.vue

@@ -58,7 +58,7 @@
           </div>
         </div>
         <div class="info-item-box">
-          <div class="label">优惠金额:</div>
+          <div class="label">优惠金额</div>
           <div :class="['value']">-{{ usingTotalDiscount | currency }}</div>
         </div>
         <div class="van-hairline--bottom hr"></div>