Normalise digits in time formatter

Fixes formatting of dates when language is set to Arabic
or other such language that has localised digits.

Ideally we should support localised digits, but that needs
to be done together with the parser handling them. (bug 63732)

Bug: 63733
Change-Id: I251b16a4bd6b81811eb561dbf623425db8c09be8
Merge "Normalise digits in time formatter"