bug-709:项目分类选择后，应该允许取消，不然选错了只能关闭弹框

src/views/business/components/AcupointTable.vue

@@ -42,6 +42,7 @@
             size="mini"
             v-model="addForm.category"
             placeholder="请选择"
+            clearable
             style="flex: 1"
             @change="onCategoryChange"
           >