直接页面的popup，返回键处理

lib/widget/live/live_room_user_header.dart

@@ -115,7 +115,11 @@ class LiveRoomUserHeader extends StatelessWidget {
                                   // 关闭设置弹窗
                                   SmartDialog.dismiss();
                                   // 弹出解除连麦对话框
+                                  roomController.setDialogDismiss(true);
                                   SmartDialog.show(
+                                    onDismiss: (){
+                                      roomController.setDialogDismiss(false);
+                                    },
                                     builder: (context) {
                                       return DisconnectMicDialog();
                                     },