Fixed ruff format

Author: Aniketsy

pandas/core/strings/accessor.py

@@ -1350,9 +1350,7 @@ def contains(
         if regex:
             try:
                 _compiled = (
-                    pat
-                    if isinstance(pat, re.Pattern)
-                    else re.compile(pat, flags=flags)
+                    pat if isinstance(pat, re.Pattern) else re.compile(pat, flags=flags)
                 )
                 if _compiled.groups:
                     warnings.warn(