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

========

https://hg.mozilla.org/integration/gaia-central/rev/730a2e659fc9
Author: KWierso <kwierso@gmail.com>
Desc: Revert "Merge pull request #20532 from timdream/keyboard-modify-layout" for most likely causing a really frequent gaia-ui test failure

This reverts commit a6c97a8924e9649052e7e33878ae4d28441975fd, reversing
changes made to 2d50292b3f4f8adce0680a9cd2df76f339f55ff3.
Bumping manifests a=b2g-bump