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

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https://hg.mozilla.org/integration/gaia-central/rev/d48fa23f94b5
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #21171 from snowmantw/issue1024951

Bug 1024951 - [NFC] Dialer screenshot shows on shrink UI ...

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https://hg.mozilla.org/integration/gaia-central/rev/9c728d4c9054
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1024951 - [NFC] Dialer screenshot shows on shrink UI when try to share contact if dialer is running on the background

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "dcd24331f985e1a7c96800d3c9b74c08f0e72521", 
+    "revision": "d48fa23f94b57e69740a4e61fa2ef11d69ae9e68", 
     "repo_path": "/integration/gaia-central"
 }