In the first commit (66bbb9d), I needed the ability to not set maxFontSize=true when calling `formatPhoneNumber`. I tried modifying `restorePhoneNumber` to accept ellipsesSide and maxFontSize, and have them default to "end" and true respectively, but this seemed wonky. So I created this new function `reformatPhoneNumber` to act like restore, but accept these params.

However, based on Riks feedback (https://bugzilla.mozilla.org/show_bug.cgi?id=974211#c13) we no longer want dynamic font sizing, so you are right we can just use `restorePhoneNumber` :)