fix(franka): left over ik refactor #99

Job	Run time
pythonpackage	3m 24s
check-paths	10s
build_cpp_extensions (rcs_panda)	28s
build_extensions (rcs_tacto)	2m 41s
build_cpp_extensions (rcs_fr3)	48s
build_cpp_extensions (rcs_so101)	37s
build_extensions (rcs_realsense)	2m 32s
build_extensions (rcs_xarm7)	5m 57s
build_cpp_extensions (rcs_robotics_library)	25s
build_extensions (rcs_usb_cam)	2m 35s
	19m 37s

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