Fix a bug in access to matrix3d elements.
Fix a bug in access to matrix3d elements.

	* unitTesting/TestHumanoidDynamicRobot.cpp: replace MAL_S4x4_MATRIX_ACCESS_I_J
	by MAL_S3x3_MATRIX_ACCESS_I_J.

jrl-umi3218/jrl-dynamics,jrl-umi3218/jrl-dynamics