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

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https://hg.mozilla.org/integration/gaia-central/rev/5f2853e302bf
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19850 from TheoChevalier/l10n-homescreen-fix

Bug 1018601 - Fix l10n for homescreen layout settings

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https://hg.mozilla.org/integration/gaia-central/rev/5a7b758a2c5c
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 1018601 - Fix l10n for homescreen layout settings
Bumping manifests a=b2g-bump