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

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https://hg.mozilla.org/integration/gaia-central/rev/3d2c69d28cbf
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #24463 from azasypkin/bug-1003843-group-image

Bug 1003843 - Follow up to Bug 951676 - [Messages][Refresh] Add specific image in case of more than one recipient in the list threads. r=julien, schung

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https://hg.mozilla.org/integration/gaia-central/rev/b581a026cc06
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1003843 - Follow up to Bug 951676 - [Messages][Refresh] Add specific image in case of more than one recipient in the list threads. r=julien, schung
Bumping manifests a=b2g-bump