Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/bd4ba5f1f35c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 962918 - Update gaia-node-modules to v1.1.7"

This reverts commit f472e0e85d5684b2ddeacb4a6f220c77f423e228.

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https://hg.mozilla.org/integration/gaia-central/rev/c57a992f4a5e
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #18462 from justindarc/bug993686

Bug 993686 - [B2G][Camera] - Tapping repeatedly on capture button while ...

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https://hg.mozilla.org/integration/gaia-central/rev/0f0f1574ea23
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 993686 - [B2G][Camera] - Tapping repeatedly on capture button while setting wallpaper can permanently freeze the camera app

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "4a76714630299428904619cc6302f7ab3d099929", 
+    "revision": "bd4ba5f1f35c4a7124639e8c7f1ab7f1d0becedd", 
     "repo_path": "/integration/gaia-central"
 }