Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/1bf61ff8f2d6
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #10755 from eeejay/homescreen-a11y-tweaks

Homescreen a11y tweaks

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https://hg.mozilla.org/integration/gaia-central/rev/cf7e4ddfa314
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 885404 - Reintroduce hiding non-current pages in homescreen. r=crdlc

This puts back in place a change that was first introduced in 2d4ce6b3fb7f75d140cefeded599022a186db596.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "ab2285ccc529082e97c3468b9d5ce3edb46fe92d", 
+    "revision": "1bf61ff8f2d687c6d1a9eae2d98a3a522b1297f3", 
     "repo_path": "/integration/gaia-central"
 }