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

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https://hg.mozilla.org/integration/gaia-central/rev/0a26eafbba1c
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #20011 from borjasalguero/mobileid_ui"

This reverts commit 270a833e262dfbaf855cc6954d23a55f92c60db5, reversing
changes made to 131c5cce4afe158b1db0be58f980130ccc1ab34a.

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https://hg.mozilla.org/integration/gaia-central/rev/c9dfd4ce33e8
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #19559 from acperez/bug-1009633"

This reverts commit 8cee6e0e1b8037ec22c010399d7f2d06f3d9b0d2, reversing
changes made to 2cfd8e79ca6ee6bd163d3f4748e00af239cf2f23.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "a2f40dcb6d96592d223e13df4fc4b7b48a8b1ee0", 
+    "revision": "0a26eafbba1c1cf459dae8b1c44b3c8b6d08f112", 
     "repo_path": "/integration/gaia-central"
 }