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

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https://hg.mozilla.org/integration/gaia-central/rev/9d97cdea7f36
Author: BavarianTomcat <tomcat@mozilla.com>
Desc: Revert "Bug 1018283 - [Follow-up 951665] Pending visual revision and adjustments of the VR call screen when in lockscreen" for failing Gaia Unit Tests

This reverts commit da533fe56eda32a6b31c893996e34e138bcd8ef7.
Bumping manifests a=b2g-bump