Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-1_3/rev/2d882f134915
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #16464 from jrburke/bug974292-email-done-blank

Bug 974292 - [Email][V1.3&V1.4] Tapping the Done button of mail settings page redirects to a blank page r=asuth
Bumping manifests a=b2g-bump