Limit invited_group search to public or visible to user

Added `public_or_visible_to_user(:user)` to group.shared_with_group
query to limit query scope, as is done ton members_finder.rb:76 for the
project side.
Changelog: fixed
Signed-off-by: Lucas Zampieri <lzampier@redhat.com>

app/finders/group_members_finder.rb

@@ -60,7 +60,7 @@ class GroupMembersFinder < UnionFinder
     when [:descendants, :direct, :inherited]
       group.self_and_hierarchy
     when [:direct, :inherited, :shared_with_groups]
-      find_union([group.self_and_ancestors, group.shared_with_groups], Group)
+      find_union([group.self_and_ancestors, group.shared_with_groups.public_or_visible_to_user(user)], Group)
     else
       nil
     end