Tweaks to fix autofill context menu position

[bsclifton]

• 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 #3359
Depends on brave/muon#44

[bridiver]

if we merge this before the electron update will it make things worse or will it not matter?

[bsclifton]

@bridiver shouldn't matter- this is all custom code 👍