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

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https://hg.mozilla.org/integration/gaia-2_0/rev/996d67543680
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Bug 1029581 - Re-add value_selector.js and wallpaper.js to jshint whitelist.
Bumping manifests a=b2g-bump