Bumping gaia.json for 1 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/43ba7a46f5f1
Author: Fabrice Desré <fabrice@desre.org>
Desc: Revert "Bug 893800 - Add a way to install apps on a specific grid position"

This reverts commit 238445f4149331ef90db31f73c089bd0c20852e0.