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

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https://hg.mozilla.org/integration/gaia-central/rev/8bf9812dae9f
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #19088 from 6a68/bug-980638-resubmitted

Bug 980638 - Correctly detect FTU state from FxA dialog

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https://hg.mozilla.org/integration/gaia-central/rev/46cceb84e3e8
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 980638 - Correctly detect FTU state from FxA dialog. r=ferjm

    We were improperly detecting whether FTU was running from the FxA dialog.
    Now we properly signal this by passing the 'isftu=true' query string to
    the dialog when it's created.
Bumping manifests a=b2g-bump