settings: Remove 'Switch` and `Logout` buttons.
settings: Remove 'Switch` and `Logout` buttons.

They were placed there not because it made too much sense (they are
not a configuration option) but because we did not have a Profile
tab/screen. Now we do, so they are removed.

vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile