apply aj suggestion

Author: aaronsteers

airbyte_cdk/cli/airbyte_cdk/_image.py

@@ -131,7 +131,11 @@ def image_test(  # "image test" command
     connector_name, connector_directory = resolve_connector_name_and_directory(connector)
 
     # Select only tests with the 'image_tests' mark
-    pytest_args = ["-m", "image_tests and not requires_creds" if no_creds else "image_tests"]
+    pytest_filter = "image_tests"
+    if no_creds:
+        pytest_filter += " and not requires_creds"
+
+    pytest_args = ["-m", pytest_filter]
     if not image:
         metadata_file_path: Path = connector_directory / "metadata.yaml"
         try: