removing unnecessary if check

Author: mhoecke1

pr_agent/git_providers/bitbucket_server_provider.py

@@ -144,7 +144,7 @@ def get_best_common_ancestor(source_commits_list, destination_commits_list, guar
 
         for commit in source_commits_list:
             for parent_commit in commit['parents']:
-                if commit['id'] in destination_commit_hashes or parent_commit['id'] in destination_commit_hashes:
+                if parent_commit['id'] in destination_commit_hashes:
                     return parent_commit['id']
 
         return guaranteed_common_ancestor