Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/049d2fa56f48
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #16204 from timdream/screenshot-hires-cover

Bug 971631 - Correct screenshot dimension, r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/2fd02eec5e26
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 971631 - Correct screenshot dimension

========

https://hg.mozilla.org/integration/gaia-central/rev/8cc50c5a37de
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Revert "Merge pull request #15808 from pmclanahan/send-language-to-basket-964342"

This reverts commit a2fbd8f96a6d262393832f23897c09349d398981, reversing
changes made to c627269a09d9479d0d8151c9918ae9dad0b5df37.
Bumping manifests a=b2g-bump