Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/0b4840627120
Author: Arthur Chen <crh0716@gmail.com>
Desc: Revert "Bug 1033950 - [Settings] update selectors in AMDed wifi panel from #id to .class"

This reverts commit 1606f439fd4c7bbbbbd721d59d8e46b7523cd71a.
Bumping manifests a=b2g-bump