Improve path collision check formatting

Refactor path collision check for readability.

radicale/pathutils.py

@@ -285,9 +285,8 @@ def path_to_filesystem(root: str, sane_path: str) -> str:
         safe_path = os.path.join(safe_path, part)
         # Check for conflicting files (e.g. case-insensitive file systems
         # or short names on Windows file systems)
-        if (os.path.lexists(safe_path) and
-            not os.path.realpath(safe_path).endswith(part)):
-                raise CollidingPathError(part)
+        if (os.path.lexists(safe_path) and not os.path.realpath(safe_path).endswith(part)):
+            raise CollidingPathError(part)
     return safe_path