fix restoreHistory title replacment

[MichaelWest22]

Description

It seems that when the handleTitle() function was introduced the restoreHistory() title setting code was accidently changed to use fragment.title instead of the proper cached.title. Firefox does not keep track of title during history switching so title doesn't change now because there is no title inside the fragment data. Chrome works fine as it tracks the page title itself.

Corresponding issue:
#2833

Testing

I've tested this trival change in firefox and chrome to make sure it works fine and updates the title as expected

Checklist

• I have read the contribution guidelines
• I have targeted this PR against the correct branch (master for website changes, dev for
  source changes)
• This is either a bugfix, a documentation update, or a new feature that has been explicitly
  approved via an issue
• I ran the test suite locally (npm run test) and verified that it succeeded

[1cg]

Great fix, thank you!