restore "新增合同" button in goods detail component

src/views/OrderTrack/goodsDetail.vue

@@ -34,7 +34,7 @@
                 <el-select v-model="selectedLang" placeholder="" style="margin-left:10px;width: 5%;">
                     <el-option v-for="option in langOptions" :label="option.label" :value="option.value" :key="option.value"></el-option>
                 </el-select>
-                <!-- <el-button type="primary" @click="addContract" style="margin-left:10px;">新增合同</el-button> -->
+                <el-button type="primary" @click="addContract" style="margin-left:10px;">新增合同</el-button>
             </div>
             <div class="data-box th-all" style="margin-bottom:20px;">
                 <el-table :data="contractData" border>