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

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https://hg.mozilla.org/integration/gaia-central/rev/43a243150d2c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1106411 - [PrivacyPanel] Change role to system"

This reverts commit b84a94ee25edaf3ee32461ea3299d57ff1a6a4f0.
Bumping manifests a=b2g-bump