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

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https://hg.mozilla.org/integration/gaia-central/rev/3672de9c994b
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #13940 from gasolin/issue-929369

Bug 929369 - [Flatfish][System] Make value selector dialogs not fill ful..., r=rudy

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https://hg.mozilla.org/integration/gaia-central/rev/eeed58c27f82
Author: gasolin <gasolin@gmail.com>
Desc: Bug 929369 - [Flatfish][System] Make value selector dialogs not fill full screen