opt: get theme color

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/member/content/member_home/widget/fav_item.dart

@@ -28,7 +28,6 @@ class MemberFavItem extends StatelessWidget {
         },
         onLongPress: () {
           imageSaveDialog(
-            context: context,
             title: item['title'],
             cover: item['cover'],
           );