update src/components/Descriptions/src/Descriptions.vue.

字段映射的功能点添加，已测

Signed-off-by: AKING <2734339436@qq.com>

src/components/Descriptions/src/Descriptions.vue

@@ -129,7 +129,11 @@ const toggleClick = () => {
               <slot v-else-if="item.dictType">
                 <DictTag :type="item.dictType" :value="data[item.field] + ''" />
               </slot>
-              <slot v-else :name="item.field" :row="data">{{ data[item.field] }}</slot>
+              <slot v-else :name="item.field" :row="data">
+                {{
+                    item.mappedField ? data[item.mappedField] : data[item.field]
+                }}
+              </slot>
             </template>
           </ElDescriptionsItem>
         </ElDescriptions>