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

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https://hg.mozilla.org/integration/gaia-1_4/rev/03d3fad36575
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 987847 - Resolve timing in test_settings_wallpaper.py and re-enable
Bumping manifests a=b2g-bump