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

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https://hg.mozilla.org/integration/gaia-2_1/rev/50c5d56de6e4
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Merge pull request #26432 from mikehenrty/bug-1097497-wait-for-utility-tray-open"

This reverts commit 0bc12f8d582724ec3f911ec3da4507b562a05adc, reversing
changes made to 18e02f16972f9d54931d57b13f35d2a2c0eda683.
Bumping manifests a=b2g-bump