drafts: Increase the duration of "Saved as draft" tooltip.
drafts: Increase the duration of "Saved as draft" tooltip.

Now that it's further away from the composebox, we probably want it to
be visible for longer. Doubling it from 1.5 seconds to 3 seconds seems
reasonable to start with, although we should tune it based on feedback.

zulip/zulip,rht/zulip,rht/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip,rht/zulip,andersk/zulip,kou/zulip,zulip/zulip,kou/zulip,andersk/zulip,kou/zulip,andersk/zulip,kou/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip,rht/zulip,andersk/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip