Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a84bdd809219
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #21386 from crdlc/bug-1033926

Bug 1033926 - [Vertical Homescreen] Statusbar does not get opaque after ...

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https://hg.mozilla.org/integration/gaia-central/rev/e3b1a9ff7e97
Author: crdlc <crdlc@tid.es>
Desc: Bug 1033926 - [Vertical Homescreen] Statusbar does not get opaque after exiting an app using the keyboard and re-entering it
Bumping manifests a=b2g-bump