Kan groep niet deselecteren in gebruikerslijst

[manuel (Manuel Kostka)]

Just a small issue, but it seems the “all groups”-link in the user listing drop-down is not working:

[ondrej]

I can reproduce the bug. F12 said this:

[vinothkannans (Vinoth Kannan)]

I added a fix here

https://github.com/discourse/discourse/pull/14795