Fixed overwriting defaults

Author: nwittler

c3/signal/pulse.py

@@ -41,19 +41,20 @@ def __init__(
             self.shape = envelopes[shape]
         else:
             self.shape = shape
-        self.params = {
+        default_params = {
             "amp": Qty(value=0.0, min_val=-1.0, max_val=+1.0, unit="V"),
             "delta": Qty(value=0.0, min_val=-5.0, max_val=+5.0, unit="V"),
             "freq_offset": Qty(value=0.0, min_val=-1.0, max_val=+1.0, unit="Hz 2pi"),
             "xy_angle": Qty(value=0.0, min_val=-1.0, max_val=+1.0, unit="rad"),
             "sigma": Qty(value=5e-9, min_val=-2.0, max_val=+2.0, unit="s"),
             "t_final": Qty(value=0.0, min_val=-1.0, max_val=+1.0, unit="s"),
         }
+        default_params.update(params)
         super().__init__(
             name=name,
             desc=desc,
             comment=comment,
-            params=params,
+            params=default_params,
         )
 
     def write_config(self, filepath: str) -> None: