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

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https://hg.mozilla.org/integration/gaia-1_4/rev/f9ac57457654
Author: EragonJ <eragonj@eragonj.me>
Desc: Revert "Merge pull request #18445 from chuck-lee/bug-997791_Gaia_ui_test_error_on_wifi_enable_disable"

This reverts commit 0a299a0f0ef33ed1dce7eb50ab900855b4d8369a.
Bumping manifests a=b2g-bump