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

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https://hg.mozilla.org/integration/gaia-central/rev/3fe56f7c250e
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #13999 from KevinGrandon/revert_bug_936201

Revert "Bug 936201 - [Status Bar] Update status bar visual design" r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/613d162e9a71
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 936201 - [Status Bar] Update status bar visual design"

This reverts commit 29000470f2d7165fb16ea3b5e29ba8022690f4dd.