Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8c4630d97a62
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #13636 from KevinGrandon/settings_desktop_shims

 Bug 936185 - [Settings] Move shims into desktop helper r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/a58ae48cdee0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 936185 - [Settings] Move shims into desktop helper.

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https://hg.mozilla.org/integration/gaia-central/rev/11d1968331aa
Author: Olav Nymoen <olav@comoyo.com>
Desc: Merge pull request #11271 from comoyo/hide_homescreen_section

Bug 899995 - [Settings] Hide homescreen section if there is only one homescreen. r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/aaaab1cb3bc8
Author: Olav Nymoen <olav@comoyo.com>
Desc: Bug 899995 - [Settings] Hide homescreen section if there is only one
homescreen. r=vingtetun