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

========

https://hg.mozilla.org/integration/gaia-central/rev/1eb095d3f426
Author: Yi-Fan Liao <begeeben@gmail.com>
Desc: Revert "Bug 1004329 - [Flatfish][Homescreen] Returning home (landscape) from portrait app causes app icons to misalign/overlap"

This reverts commit a003ff47ad6f6c558ac7290b40980d71ceb6d358.
Bumping manifests a=b2g-bump