Do not keep is_deprecated License flag

No deprecated license can participate in detection.

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

src/licensedcode/models.py

@@ -462,6 +462,7 @@ def to_reference(self):
         """
         # include everything
         data = self._to_dict(include_field=lambda k, v: True)
+        data.pop('is_deprecated', None)
         data['scancode_url'] = self.spdx_url
         data['licensedb_url'] = self.spdx_url
         data['spdx_url'] = self.spdx_url