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

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https://hg.mozilla.org/integration/gaia-central/rev/cc19eb825976
Author: Mihai Cîrlănaru <mihai@cirlanaru.com>
Desc: Merge pull request #13677 from mcirlanaru/bug_937507

Bug 937507 - [Settings] Update WiFi > WPS value selector style. r=@crh0716

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https://hg.mozilla.org/integration/gaia-central/rev/6580d2f67c44
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 937507 - [Settings] Update WiFi > WPS value selector style. r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/deff2cb9a4bf
Author: Mihai Cîrlănaru <mihai@cirlanaru.com>
Desc: Merge pull request #13678 from mcirlanaru/bug_937970

Bug 937970 - [Settings] Move 'Sample Format' section below language... r=@crh0716

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https://hg.mozilla.org/integration/gaia-central/rev/60c4f76ef566
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 937970 - [Settings] Move 'Sample Format' section below language selector. r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/8d0ce9f78d53
Author: Mihai Cîrlănaru <mihai@cirlanaru.com>
Desc: Merge pull request #13676 from mcirlanaru/bug_937489

Bug 937489 - [Settings] Fix list buttons. r=@crh0716

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https://hg.mozilla.org/integration/gaia-central/rev/3654fed55576
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 937489 - [Settings] Fix list buttons. r=arthurcc