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

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https://hg.mozilla.org/integration/gaia-central/rev/ecfb83057457
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert " Bug 1055972 - disable keyboard uninstallation test."

This reverts commit e276b38a14e89c8b5bb36052f475d37716656d2a.
Bumping manifests a=b2g-bump