Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/12ce18ef7139
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #21714 from pivanov/bug-1035730

Bug 1035730 - [System] - remove unused images

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https://hg.mozilla.org/integration/gaia-central/rev/f86c3a59b86d
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1035730 - [System] - remove unused images

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https://hg.mozilla.org/integration/gaia-central/rev/a22e0f3726ce
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #21695 from pivanov/bug-1035720

Bug 1035720 - [everything.me] - remove unused images

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https://hg.mozilla.org/integration/gaia-central/rev/308685d9b0b4
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1035720 - [everything.me] - remove unused images

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https://hg.mozilla.org/integration/gaia-central/rev/9fc523f59afb
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #21165 from EragonJ/bug-1032070

Bug 1032070 - [Settings] add done feature in onBeforsShow()

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https://hg.mozilla.org/integration/gaia-central/rev/2c7d2882dd91
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1032070 - [Settings] add done feature in onBeforsShow()
Bumping manifests a=b2g-bump