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

========

https://hg.mozilla.org/integration/gaia-1_4/rev/a3c39ae1b8e2
Author: DouglasSherk <github@sherk.me>
Desc: Bug 1032502 - [Callscreen] Import contacts.xxx.properties l10n files into Callscreen to fix phone type label. r=etienne
Bumping manifests a=b2g-bump