fix(admin): 移除 date-picker value-format 避免 400

cfc-web/src/views/admin/Activities.vue

@@ -156,12 +156,12 @@
         <el-row :gutter="16">
           <el-col :span="12">
             <el-form-item label="开始时间">
-              <el-date-picker v-model="form.startTime" type="datetime" placeholder="选择开始时间" style="width:100%" value-format="yyyy-MM-dd HH:mm:ss" />
+              <el-date-picker v-model="form.startTime" type="datetime" placeholder="选择开始时间" style="width:100%" />
             </el-form-item>
           </el-col>
           <el-col :span="12">
             <el-form-item label="结束时间">
-              <el-date-picker v-model="form.endTime" type="datetime" placeholder="选择结束时间" style="width:100%" value-format="yyyy-MM-dd HH:mm:ss" />
+              <el-date-picker v-model="form.endTime" type="datetime" placeholder="选择结束时间" style="width:100%" />
             </el-form-item>
           </el-col>
         </el-row>