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

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https://hg.mozilla.org/integration/gaia-central/rev/077742400e88
Author: Fabrice Desré <fabrice@desre.org>
Desc: Merge pull request #12870 from fabricedesre/bug925149

Bug 925149 - Launching preinstalled twitter app from a SIM Customization...

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https://hg.mozilla.org/integration/gaia-central/rev/4375e9a99c71
Author: Fabrice Desré <fabrice@desre.org>
Desc: Bug 925149 - Launching preinstalled twitter app from a SIM Customization launches marketplace, not twitter r=yurenju