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

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https://hg.mozilla.org/integration/gaia-central/rev/f1f4304e9f2f
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #15162 from gaye/bug-958144

Bug 958144 - Email local drafts name marionette orange

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https://hg.mozilla.org/integration/gaia-central/rev/54b761696c8c
Author: Gareth Aye <gaye@mozilla.com>
Desc: Bug 958144 - Email local drafts name marionette orange