TypographyEllipsis: replace unicode with xml escape

The translation tool doesn't handle very well escaped character. Using a
unicode writing for Ellipsis \u2026 (…) become ... in translated file.
By using … as recommended by Android Lint and as used by other
modules. We expect the translated content to be fixed.

"Replace "..." with ellipsis character (…, …) ?"

Bug: 289445022
Flag: Exempt resource nit update
Test: m Bluetooth & regenerate lint
Change-Id: I059251ffa0d501ba398c51d60f3e3c46c783918a