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

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https://hg.mozilla.org/integration/gaia-central/rev/50ee2df60271
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #26082 from staktrace/nodompref

Bug 1072498 - Remove the apz.force-enable setting and assume it is always. r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/1a1b3315fd6a
Author: Kartikaya Gupta <kgupta@mozilla.com>
Desc: Bug 1072498 - Remove the apz.force-enable setting and assume it is always true. r=fabrice,alive
Bumping manifests a=b2g-bump