Bumping gaia.json for 1 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/e8f63cae5aff
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 900504 - l10n packaging of gaia broken, doesn't pick up content for apps. r=yurenju" for breaking Windows desktop B2G builds

This reverts commit 40b5eefa4046a3ffef9d84aaad2f520de7551f38.