Refactor sort type handling, and fetching initData/Posts, fixes default sort in community

[MV-GH]

Refactors

• Fixes community sort not using the default home sort
• Fixes swap account not changing the sort
• Show toast when saving usersettings fails
• Refactors homeFetch/initialdata, instead of putting the responsibility on each action that changes user to properly update the sort/home fetch data, now HomeActivity itself takes care of it.
• SiteViewmodel now properly updates the default in Account, basically since the navscope changes we were ignoring the local DB defaults, previously it waited until /site responded before fetching home posts, now it instantly fetches using the info from the account.

Fixes #1163
Fixes #886

Note: since account default sort/list types haven't been updates since like 0.34, many will be out of date, thus when those user launch it, it will fetch the home posts twice, once with those settings from that account and once /site is retrieved and updates the account default which triggers another fetch but with the latest sort.