Adding mass in the constructors of al5d(_mdw)

roboticstoolbox/models/DH/AL5D.py

@@ -91,6 +91,7 @@ class AL5D(DHRobot):
                 a=a[j],
                 alpha=alpha[j],
                 offset=offset[j],
+                m=mass[j],
                 r=center_of_mass[j],
                 I=moments_of_inertia[j],
                 G=1,

roboticstoolbox/models/DH/AL5D_mdw.py

@@ -94,6 +94,7 @@ class AL5D_mdw(DHRobot):
                 a=a[j],
                 alpha=alpha[j],
                 offset=offset[j],
+                m=mass[j],
                 r=center_of_mass[j],
                 I=moments_of_inertia[j],
                 G=1,