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

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https://hg.mozilla.org/integration/gaia-central/rev/c7792529a7fa
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #24548 from gabrielesvelto/bug-1072884-remove-keyboard-ftu-enabled-setting

Bug 1072884 - Remove all uses of the obsolete 'keyboard.ftu.enabled' setting r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/a604d359eb60
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1072884 - Remove all uses of the obsolete 'keyboard.ftu.enabled' setting r=timdream
Bumping manifests a=b2g-bump