Update og_subgroups to latest commit

I discovered a major UI issue with OG Subgroups today, reported by a Commons user on 2.3. Basically, the issue is that, if you disable "group" as a subgroup type, all "group" options are removed from the selection list when trying to add content to a group. The other co-maintainer of the module attempted to fix it, so the corresponding issue has been closed, but after reviewing that commit, it was actually causing more problems than it was solving. I just committed a fix to clear everything up. I recommend we up Commons to the latest.

This issue is most likely going unnoticed, because if you enable commons_subgroups - why would you disable subgroups for the "group" type. Makes no sense, but the bug condition is possible.

#1189444: Standard groups not avaiable in audience selector