修改Button的XTS

Signed-off-by: Nzhangxiao150 <zhangxiao150@huawei.com>
Change-Id: Ib213be5966ceab7626da58cd6d367b9cbb44d1a5

arkui/ace_ets_components_ux/ace_ets_component_button/src/main/ets/test/button.ets

@@ -631,7 +631,7 @@ export default function buttonTest() {
           let labelStyle = JSON.parse(obj.$attrs.labelStyle)
           console.info("ArkUX_Stage_Button_LabelStyle_2100 component obj.$attrs.labelStyle is: " +
                        JSON.stringify(labelStyle));
-          expect(labelStyle.overflow).assertEqual("TextOverflow.Clip");
+          expect(labelStyle.overflow).assertEqual("TextOverflow.Ellipsis");
           console.info('ArkUX_Stage_Button_LabelStyle_2100 END ');
         } catch(err) {
           expect().assertFail()