less code based on new getunit() features

Author: petercorke

roboticstoolbox/robot/BaseRobot.py

@@ -1904,9 +1904,7 @@ def addconfiguration_attr(self, name: str, q: ArrayLike, unit: str = "rad"):
 
         """
 
-        v = getvector(q, self.n)
-        v = getunit(v, unit)
-        v = np.array(v)
+        v = getunit(q, unit, dim=self.n)
         self._configs[name] = v
         setattr(self, name, v)