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

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https://hg.mozilla.org/integration/gaia-2_1/rev/94ad61aac925
Author: mai <mri@tid.es>
Desc: Bug 1080473 - [Usage] Noticeable difference between by application breakdown totals and the total displayed in chart and widget

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https://hg.mozilla.org/integration/gaia-2_1/rev/e0299b54dd56
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1082234 - Set a default value when the stored value is unavailable
Bumping manifests a=b2g-bump