chore: removing owlbot directives for conversion to main

Author: nicain

owlbot.py

@@ -41,6 +41,3 @@
 python.py_samples(skip_readmes=True)
 
 # Remove the replacements below once https://github.com/googleapis/synthtool/pull/1188 is merged
-
-# Update googleapis/repo-automation-bots repo to main in .kokoro/*.sh files
-s.replace(".kokoro/*.sh", "repo-automation-bots/tree/master", "repo-automation-bots/tree/main")