recent_topics: Fix partially hidden row sometimes in recent topics.
recent_topics: Fix partially hidden row sometimes in recent topics.

The top row of the RT can be hidden sometimes after scrolling down
and then scrolling up. This is because the focus is applied before
the row is rendered. Applying the focus after the topic row is
rendered by the browser makes sure it is always visisble when
it needs to be.

rht/zulip,andersk/zulip,hackerkid/zulip,hackerkid/zulip,punchagan/zulip,zulip/zulip,eeshangarg/zulip,hackerkid/zulip,andersk/zulip,zulip/zulip,zulip/zulip,punchagan/zulip,eeshangarg/zulip,andersk/zulip,zulip/zulip,eeshangarg/zulip,punchagan/zulip,rht/zulip,eeshangarg/zulip,hackerkid/zulip,hackerkid/zulip,kou/zulip,eeshangarg/zulip,andersk/zulip,rht/zulip,kou/zulip,rht/zulip,zulip/zulip,punchagan/zulip,rht/zulip,kou/zulip,kou/zulip,punchagan/zulip,andersk/zulip,hackerkid/zulip,kou/zulip,punchagan/zulip,hackerkid/zulip,rht/zulip,zulip/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,punchagan/zulip,andersk/zulip,kou/zulip,andersk/zulip