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

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https://hg.mozilla.org/integration/gaia-central/rev/03480d78d045
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #23752 from crdlc/bug-1053758-v2

Bug 1053758 - Update add to home screen dialog to meet new interaction a...

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https://hg.mozilla.org/integration/gaia-central/rev/df44b0ed88c6
Author: crdlc <crdlc@tid.es>
Desc: Bug 1053758 - Update add to home screen dialog to meet new interaction and UX specs
Bumping manifests a=b2g-bump