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

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https://hg.mozilla.org/integration/gaia-central/rev/78fd22cbe1f9
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #19760 from frsela/STK/Bug1016368

Bug 1016368 - STK Dialogs new layout, r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/e7fe2f980b9f
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Bug 1016368 - STK Dialogs new layout, r=vingtetun
Bumping manifests a=b2g-bump