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

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https://hg.mozilla.org/integration/gaia-central/rev/791005d13402
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 994575 - Add a call should always display the list of contacts

Some code movement for JSHint cleaning

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https://hg.mozilla.org/integration/gaia-central/rev/db538a2d6aa3
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Revert "Merge pull request #18421 from Rik/always-contact-home-994575"

The two commits should have been squashed

This reverts commit 1683d067d744af8a7a739d4a96dfee85962b529d, reversing
changes made to 0fd7a3b6de70bd9941b24a3b6c83cbc69f84d628.
Bumping manifests a=b2g-bump