`recent_view_focusable` class should be set on element whose
children can receive focus as per
`$topic_row.find(".recent_view_focusable").eq(col).children().trigger("focus")`
This commit removes the 'development' guard and makes
the UI changes related to the 'Follow Topics' project visible
outside the development environment.
Cleans up the older UI elements related to mute and unmute topics.