Changing the order of the groups of a user does not change the title

[dax (Daniela)]

Now solved via

User in multiple groups, title display and group link don't match

I’ve made two changes that can hopefully make the flow a bit more intuitive. If the user’s title is granted by their primary group, we will keep the title in sync when switching primary groups. (https://github.com/discourse/discourse/pull/6404) When removing a title (due to leaving a group, etc), we will now automatically grant the user another of their available titles. This favors primary group title over the others. (https://github.com/discourse/discourse/pull/6416)