[Fix] Adding Toolkit's TitleBar manually (#41383)

Temp fix for a VS bug when building the `PowerToys.Settings` project. 

There seems to be something wrong with the Labs TitleBar package, so
following up with the team to get it resolved. Meanwhile, I've moved the
Toolkit's source code for TitleBar to Settings as a custom control.

Once the package is fixed we can revert this change.