Remove page backup tests from allow_failures list on travis

Author: ololobus

.travis.yml

@@ -44,4 +44,4 @@ env:
 
 jobs:
     allow_failures:
-        - if: env(MODE) IN (archive, backup, delta, locking, merge, page, replica, retention, restore)
+        - if: env(MODE) IN (archive, backup, delta, locking, merge, replica, retention, restore)