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

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https://hg.mozilla.org/integration/gaia-central/rev/b20cced0ad2d
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #11408 from pivanov/bug-892086

Bug 892086 - [B2G][l10n][Spanish][Cost Control] Reset button on Settings has ellipses

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https://hg.mozilla.org/integration/gaia-central/rev/3387244f453c
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 892086 - [B2G][l10n][Spanish][Cost Control] Reset button on Settings has ellipses