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

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https://hg.mozilla.org/integration/gaia-central/rev/1ffe8638f86f
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Merge pull request #24561 from gmarty/Bug-1074028-Overlapping-rocketbar-statusbar-icons-3rd-party-apps"

This reverts commit db4125ff56efbe3e8951a6e41c1e53a47a46aa5b, reversing
changes made to a23d2c490b39c4699c9375e25c4acdf396a2fa85.
Bumping manifests a=b2g-bump