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

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https://hg.mozilla.org/integration/gaia-central/rev/0290da4c8958
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #20138 from EverythingMe/revert-hb-fix

Bug 1021664 - Revert patch for homebutton handling while Collection is o...

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https://hg.mozilla.org/integration/gaia-central/rev/1620aca2a635
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 1021664 - Revert patch for homebutton handling while Collection is open [r=kgrandon]
Bumping manifests a=b2g-bump