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

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https://hg.mozilla.org/integration/gaia-central/rev/1a98c1728b9c
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #16716 from flodolo/bug977619_dialerid

Bug 977619 - [Dialer] Use the correct l10n-id in oncall.html (select-audio-sources) r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/4d90f4714790
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 977619 - [Dialer] Use the correct l10n-id in oncall.html (select-audio-sources)
Bumping manifests a=b2g-bump