Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/29fc6af8ec9a
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #13789 from crdlc/bug-933561

Bug 933561 - App does not come to foreground if user quickly toggles bet...(cherry picked from commit 4e2a68ccd5eb0af576855777b752b4053477575e)