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

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https://hg.mozilla.org/integration/gaia-central/rev/450a6e9725d4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22850 from KevinGrandon/bug_1035272_default_entertainment_collection_icon

Bug 1035272 - [B2G][Homescreen] Entertainment smart collection icon is not migrated

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https://hg.mozilla.org/integration/gaia-central/rev/c5282abd10b1
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1035272 - [B2G][Homescreen] Entertainment smart collection icon is not migrated r=yurenju

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "86740b556acb1f8d851876b4230085804a2247b6", 
+    "revision": "450a6e9725d4233de8e973750fa740ff2ea30aad", 
     "repo_path": "/integration/gaia-central"
 }