修改扦样单申请页底部按钮外边距;

lib/page/sample_task/reap_sample_detail/reap_sample_task_page.dart

@@ -352,7 +352,7 @@ class _ReapSampleTaskPageState extends BaseLifecycleState<ReapSampleTaskPage> wi
 
   Widget buildButton() {
     Widget child;
-    EdgeInsets margin = EdgeInsets.only(left: 8, right: 8, top: 12, bottom: getBottomPadding(12));
+    EdgeInsets margin = EdgeInsets.only(left: 4, right: 4, top: 12, bottom: getBottomPadding(12));
     Widget ewmWidget = (pageStatus.value.data?.ewmfilePictureList ?? []).isEmpty
         ? const SizedBox.shrink()
         : Expanded(child: MyButton('查看二维码', onTap: startQRCode, margin: margin));