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

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https://hg.mozilla.org/integration/gaia-central/rev/e947783a7f56
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Bug 967440 - Remove some reflows on the keypad. r=Rik"

This reverts commit 4efc532570d68fc0f19fbfd39fd6e75b16082c1d.
Bumping manifests a=b2g-bump