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

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https://hg.mozilla.org/integration/gaia-central/rev/fe6fc8ce56e4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20112 from KevinGrandon/bug_1021282_vertical_wallpaper

Bug 1021282 - Change the Default Wallpaper to Illus_Flow2_Orange.jpg

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https://hg.mozilla.org/integration/gaia-central/rev/7a350675da71
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1021282 - Change the Default Wallpaper to Illus_Flow2_Orange.jpg r=me
Bumping manifests a=b2g-bump