Fixed parameter conversion name

bilby/gw/waveform_generator.py

@@ -77,7 +77,7 @@ class WaveformGenerator(object):
             tdsm_name = self.time_domain_source_model.__name__
         else:
             tdsm_name = None
-        if self.parameter_conversion.__name__ == '<lambda>':
+        if self.parameter_conversion.__name__ == '_default_parameter_conversion':
             param_conv_name = None
         else:
             param_conv_name = self.parameter_conversion.__name__