[unittest] [bindings] Remove se3 namespace shortcut from python tests

unittest/python/bindings.py

unittest/python/bindings_SE3.py

unittest/python/bindings_com.py

unittest/python/bindings_dynamics.py

unittest/python/bindings_force.py

unittest/python/bindings_frame.py

unittest/python/bindings_geometry_object.py

unittest/python/bindings_geometry_object_urdf.py

unittest/python/bindings_inertia.py

unittest/python/bindings_joint_composite.py

unittest/python/bindings_motion.py

unittest/python/explog.py

unittest/python/model.py

unittest/python/utils.py