Small refactoring

Author: rdesarz

biped_walking_controller/plot.py

@@ -192,8 +192,8 @@ def plot_contact_forces(
     t: float,
     force_rf: float,
     force_lf: float,
-    states: ,
-    title: str ="Contact force Fx",
+    states: WalkingState,
+    title: str = "Contact force Fx",
 ):
     t = np.asarray(t).ravel()
     force_rf = np.asarray(force_rf).ravel()