Cleanup Android accessibility options

Firstly on the auto fill settings there should be a permamant link/button to both types of autofill’s settings page. Currently the accessibility autofill link is always there but the Oreo autofill link is removed once its selected.

Secondly the various autofill options for accessibility autofill should all be properly disabled and hidden if accessibility isn’t enabled for bitwarden. Its confusing to show these if they aren’t active and you can currently turn them all off (it shows that you have but re-entering settings shows one has been toggled on again).