fix(gitlab): user and group link

closes #115

lib/screens/gl_groups.dart

@@ -24,7 +24,7 @@ class GlGroupsScreenn extends StatelessWidget {
         );
       },
       itemBuilder: (v) {
-        return UserItem.gitlab(
+        return UserItem.gitlabGroup(
           avatarUrl: v.avatarUrl,
           login: v.path,
           name: v.name,

lib/widgets/user_item.dart

@@ -32,6 +32,14 @@ class UserItem extends StatelessWidget {
     @required this.avatarUrl,
     @required this.bio,
     @required int id,
+  }) : url = '/gitlab/user/$id';
+
+  UserItem.gitlabGroup({
+    @required this.login,
+    @required this.name,
+    @required this.avatarUrl,
+    @required this.bio,
+    @required int id,
   }) : url = '/gitlab/group/$id';
 
   UserItem.gitea({