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

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https://hg.mozilla.org/integration/gaia-central/rev/e1d4c28988d9
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Merge pull request #12758 from fcampo/retryCount-905173

Bug 905173 - PIN code screen should not display '3 tries left.' when loading (r=Rik)

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https://hg.mozilla.org/integration/gaia-central/rev/99c5b3f2c638
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Bug 905173 - PIN code screen should not display '3 tries left.' when loading

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- Changed tag to hidden
- Added tests