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

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https://hg.mozilla.org/integration/gaia-central/rev/698faea80f6b
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #23440 from benfrancis/1058096

Bug 1058096 - Add show windows button to Rocketbar on Browser start page r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/613f000b2520
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 1058096 - Add show windows button to Rocketbar on Browser start page
Bumping manifests a=b2g-bump