Change transcoding default values

1. transcode_enabled: s/false/true/
2. transcode_default: s/false/true/

This is to maintain consistence with the MediaProvider defaults and it
only affects the 'checked' state when a user hasn't checked anything

Test: Manual
Bug: 175309276
Change-Id: Ic81490a944407e30f9cd207f64f2a0f5530a23d3
2 files changed