Fix waveform arguments

bilby/gw/waveform_generator.py

@@ -55,6 +55,9 @@ class WaveformGenerator(object):
             self.waveform_arguments = waveform_arguments
         else:
             self.waveform_arguments = dict()
+        for key in self.waveform_arguments.keys():
+            if key in self.source_parameter_keys:
+                self.source_parameter_keys.remove(key)
         if isinstance(parameters, dict):
             self.parameters = parameters
         self.__frequency_array_updated = False