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

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https://hg.mozilla.org/integration/gaia-central/rev/7e6c5414f073
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1035250 - Add incremental statusbar icons in FTU"

This reverts commit bb42eaf2b585f01e7106d3b6783e91e0e40caf68.
Bumping manifests a=b2g-bump