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

========

https://hg.mozilla.org/integration/gaia-central/rev/24f50300e31d
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #19050 from gasolin/issue-959052

Bug 959052 - [NFC] rotating of shrink UI is wrong, r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/4a0b6df8acc1
Author: gasolin <gasolin@gmail.com>
Desc: Bug 959052 - [NFC] rotating of shrink UI is wrong

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "900b43e1e6cc5f73748ce0eb72b84756bc0f2845", 
+    "revision": "24f50300e31d0644ebaa04f8778f851bf843c546", 
     "repo_path": "/integration/gaia-central"
 }