Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/3439f7876a52
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15201 from viorelaioia/bug_958542

Bug 958542 - [v1.3] Update locator in test_gallery_delete_image

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https://hg.mozilla.org/integration/gaia-1_3/rev/7dc7760e5fdb
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 958542 - [v1.3] Update locator in test_gallery_delete_image