修改用户，性别回显问题修改

src/views/system/user.vue

@@ -197,8 +197,8 @@
           <el-col :span="12">
             <el-form-item label="用户性别" prop="sex">
               <el-select v-model="form.sex" placeholder="请选择性别">
-                <el-option :key="0" label="女" :value="0"/>
-                <el-option :key="1" label="男" :value="1"/>
+                <el-option key="0" label="女" value="0"/>
+                <el-option key="1" label="男" value="1"/>
               </el-select>
             </el-form-item>
           </el-col>