Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/9f3b6b772b7b
Author: Julien Wajsberg <felash@gmail.com>
Desc: Revert "Merge pull request #21162 from yurenju/callscreen"

This reverts commit 061e9b84a9742fa9ad0519b7b98f1b50fc212be8, reversing
changes made to 34df8238f7367ac99b6897a073b9cc2f82f5371a.
Bumping manifests a=b2g-bump