Fix typo that makes a string a tuple

* Just one tiny comma that needs to be moved downwards!
* This breaks conda skeleton, which parses the pkginfo.yaml
and doesn't expect a tuple/list there, see
conda/conda-build#4227

Author: vvzen

setup.py

@@ -334,8 +334,8 @@ def test_otio():
             'otiopluginfo = opentimelineio.console.otiopluginfo:main',
             (
                 'otioautogen_serialized_schema_docs = '
-                'opentimelineio.console.autogen_serialized_datamodel:main',
-            )
+                'opentimelineio.console.autogen_serialized_datamodel:main'
+            ),
         ],
     },
     extras_require={