Bug 931977 - [Keyboard] Ensure first keyboard shown is properly initialized - r=rudyl

- use the `setKeyboardName` during first keyboard load
- Renabled TBPL test

Closes gh-13192
(cherry picked from commit b6221a5ecdeb1252c42f6a7b5628c90c1888346b)

Conflicts:
	tests/python/gaia-ui-tests/gaiatest/tests/tbpl-manifest.ini