Do not format numbers starting with hash or star.

If the user asks to format a number that starts with either a hash or a
star symbol, do not further format the phone number since we are not
actually able to parse such a number correctly and current this results
in the star or hash being dropped.

Bug: 5362177
Change-Id: Iff8d317c087d0ca07f2b107459ce8c47882ef367