Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/745a9504cc03
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Bug 983777 - [B2G][Contacts] Tapping the Favorite button on an imported facebook contact will break the Edit Contact button"

This reverts commit a9b63fa5001dfe7e1fa8bdffe2e4bdc5d5221027.
Bumping manifests a=b2g-bump