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

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https://hg.mozilla.org/integration/gaia-central/rev/a5a347912851
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #19919 from crdlc/bug-1017492

Bug 1017492 - Follow-up bug 1010352 - Add icon for homescreen panel in t...

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https://hg.mozilla.org/integration/gaia-central/rev/5c760f543d6c
Author: crdlc <crdlc@tid.es>
Desc: Bug 1017492 - Follow-up bug 1010352 - Add icon for homescreen panel in the root list of settings app
Bumping manifests a=b2g-bump