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

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https://hg.mozilla.org/integration/gaia-central/rev/ff6f50a3f291
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Merge pull request #19837 from millermedeiros/1016687-toggle-calendar

Bug 1016687 - [B2G][Calendar] - Event icons / indicators (dots below the date) are still visible in month view after disabling offline calendar r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/88c69a968dfd
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 1016687 - [B2G][Calendar] - Event icons / indicators (dots below the date) are still visible in month view after disabling offline calendar
Bumping manifests a=b2g-bump