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

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https://hg.mozilla.org/integration/gaia-central/rev/50b555b742e6
Author: pacorampas <b.frv@tid.es>
Desc: Merge pull request #23665 from pacorampas/1059053

Bug 1059053 - [Messages][SMS] Icon in Message report is truncated r=borjasalguero

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https://hg.mozilla.org/integration/gaia-central/rev/1ab020a3a2b2
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1059053 - [Messages][SMS] Icon in Message report is truncated
Bumping manifests a=b2g-bump