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

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https://hg.mozilla.org/integration/gaia-central/rev/506635e2bf3f
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #23281 from benfrancis/1056884

Bug 1056884 - Implement special expanded Rocketbar state for browser start page r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/1ddf839cff25
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 1056884 - Implement special expanded Rocketbar state for browser start page

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "2fb42aadc02837e6ccfcb3d728a02190655595a2", 
+    "revision": "506635e2bf3f75f275873e945746919144a5a985", 
     "repo_path": "/integration/gaia-central"
 }