Fix for setting TTS language to recently downloaded one

If user added new voice pack, then set it as a default language,
went level back and went to TTS settings again, it ended in crash.

This is because first updateVoiceDetails uses old voice data details
that settings retreived long time ago.

locales preference is hidden until TTs engine returns list of locales.

Change-Id: I33a81ff259c69adb4c051ee693b6c41b93f302d0
2 files changed