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

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https://hg.mozilla.org/integration/gaia-central/rev/dcf33fcf1dc7
Author: Sam Foster <sam@sam-i-am.com>
Desc: Merge pull request #20097 from sfoster/bug-1019098-progressbar

Bug 1019098 - Remove progressbar on FTU tutorial when <= 3 steps. r=fcampo

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https://hg.mozilla.org/integration/gaia-central/rev/57f1759c63a2
Author: Sam Foster <sfoster@mozilla.com>
Desc: Bug 1019098 - Remove progressbar on tutorial when step <= 3. Adjust CSS to allow longer descriptions that accompany video

* Tidy up CSS per review coments
* Add tests for progressbar display
Bumping manifests a=b2g-bump