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

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https://hg.mozilla.org/integration/gaia-central/rev/fc903c97b558
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #23207 from bebef1987/revert

Revert "Bug 1055983 - [v2.1] Update test_ftu_skip_tour to reflect change...

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https://hg.mozilla.org/integration/gaia-central/rev/2e882cba9447
Author: Bebe <bebe@mozilla.ro>
Desc: Revert "Bug 1055983 - [v2.1] Update test_ftu_skip_tour to reflect changes from Bug 1026098"

This reverts commit 2bbabcc1b0e2d5ec00126852454dac7124a8424f.
Bumping manifests a=b2g-bump