URL bar autocomplete mouseover does not interfere with typed URL (fixes #3012)

[willy-b]

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Ran git rebase -i to squash commits if needed.

Fixes #3012: Autofill should not happen on URL bar unless item in autocomplete list is clicked

[bbondy]

this change doesn't seem necessary, any reason for it?

[bbondy]

would you mind adding a test for this as well? Thanks.
It could go in here: test/components/navigationBarTest.js
and you could use moveToObject for a the mouse move on top of the suggestions

[willy-b]

Thanks @bbondy for all the feedback!
Closing this in favor of a new PR #3225 which is rebased against master and has the changes you requested and a test.