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

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https://hg.mozilla.org/integration/gaia-central/rev/0539edb9187e
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #22909 from gasolin/issue-1054132

Bug 1054132 - [Settings] simplify hour12 detection way, r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/2659a7f67799
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1054132 - [Settings] simplify hour12 detection way

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "5ca5ac2fe9b239c2bf27f4c25b03805c13257e9d", 
+    "revision": "0539edb9187e9a4f39ce34d4022750768d6efcab", 
     "repo_path": "/integration/gaia-central"
 }