fix syncing between react and DOM urlbar focus/select

[diracdeltas]

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

previously it seems that the urlbar was getting selected
every time the react select state was updated; yet then the
react selected state would be updated to false.

this may fix #5529

Auditors: @bbondy

Test Plan:
follow Alex's test steps in #5529
and check that the first character is not deleted.

[bbondy]

I think this is maybe the same thing that this fixed:
fcde124
Thoughts?

[bbondy]

I'll close becauseI think that's the case that it's fixed by that one, but please re-open if you don't think so, or if you think this should be merged too (it is bitrot though by mine)