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

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https://hg.mozilla.org/integration/gaia-2_0/rev/ad1ac34907bf
Author: crdlc <crdlc@tid.es>
Desc: Bug 1026153 - [Vertical homescreen] Icon gets stuck while dragging and pressing power button

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https://hg.mozilla.org/integration/gaia-2_0/rev/f1c48d45f70a
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 1026293 - Remove e.me as an available search engine and set new default in build r=kgrandon
Bumping manifests a=b2g-bump