language-settings: Increase list item vertical padding.
language-settings: Increase list item vertical padding.

Imitate (roughly) iOS conventions from this HIG page (see
the upper-right hand screenshot):
    https://developer.apple.com/design/human-interface-guidelines/ios/views/tables/

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