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

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https://hg.mozilla.org/integration/gaia-central/rev/3abae67c732d
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #12840 from gasolin/issue-923088

Bug 923088 - [Settings] Change network mode names to make them user frie..., r=crh0716

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https://hg.mozilla.org/integration/gaia-central/rev/37247f184b16
Author: gasolin <gasolin@gmail.com>
Desc: Bug 923088 - [Settings] Change network mode names to make them user friendly and consistent with previous OS versions