LakeShore335: fix typo in setpoint_ramp parameter group #15922

Job	Run time
pytestmypy (ubuntu-latest, 3.11, false)	10m 9s
pytestmypy (ubuntu-latest, 3.11, false)	10m 9s
pytestmypy (ubuntu-latest, 3.12, false)	11m 32s
pytestmypy (ubuntu-latest, 3.12, false)	11m 32s
pytestmypy (windows-latest, 3.10, false)	20m 17s
pytestmypy (windows-latest, 3.10, false)	18m 36s
pytestmypy (ubuntu-latest, 3.10, true)	6m 53s
pytestmypy (ubuntu-latest, 3.10, true)	6m 53s
	1h 36m 1s

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