No Bug - Move periodic file update start time earlier, to reflect whe…

…n buildbot used to run. r=me

MozReview-Commit-ID: APAL0xH5Bak

--HG--
extra : rebase_source : 832b6d4c9652d7e7bf5edfc70e07864d8894e05d

.cron.yml

@@ -109,6 +109,4 @@ jobs:
           by-project:
               # No default branch
               mozilla-central:
-                  # Buildbot start time is 10:02am UTC, until we are able to
-                  # disable buildbot scheduling, use +12h
-                  - {hour: 22, minute: 0}
+                  - {hour: 10, minute: 0}