build(appoptimize): fix owlbot.py format (#12802)

https://github.com/googleapis/google-cloud-java/actions/runs/24420694631/job/71341735455?pr=12801

Author: chingor13

java-appoptimize/owlbot.py

@@ -33,6 +33,5 @@
         "java.header",
         "license-checks.xml",
         "renovate.json",
-        ".gitignore",
-    ],
-)
+        ".gitignore"
+])