Bumping gaia.json for 2 gaia-central revision(s)

========

https://hg.mozilla.org/integration/gaia-central/rev/419504104ae7
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #10869 from eeejay/highlight-fix

Explicitly set the active background of lockscreen icons to none.r=mihai

========

https://hg.mozilla.org/integration/gaia-central/rev/eddd5f65c50a
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 889925 - Explicitly set the active background of lockscreen icons to none.