Bumping gaia.json for 1 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/f2454e95b24f
Author: Fabrice Desré <fabrice@desre.org>
Desc: Bug 895826 - followup, r=me

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "d337ff34f77863c015f6485dff99ff6f0369473a", 
+    "revision": "f2454e95b24f028b6ebc1b1edb880c12f80454de", 
     "repo_path": "/integration/gaia-central"
 }