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

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https://hg.mozilla.org/integration/gaia-central/rev/70bb8d586887
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22314 from KevinGrandon/bug_1046158_homescreen_settings_cleanup

Bug 1046158 - [Settings] Revert logic for column display detection

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https://hg.mozilla.org/integration/gaia-central/rev/59f5bbff706c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1046158 - [Settings] Revert bug 1029902, logic for column display detection r=me
Bumping manifests a=b2g-bump