Fix trivial warnings in 'Wheelswitch' class.
Fix trivial warnings in 'Wheelswitch' class.

EuropeanSpallationSource/openxal,openxal/openxal,EuropeanSpallationSource/openxal,EuropeanSpallationSource/openxal,luxiaohan/openxal-csns-luxh,openxal/openxal,openxal/openxal,openxal/openxal,luxiaohan/openxal-csns-luxh,EuropeanSpallationSource/openxal,luxiaohan/openxal-csns-luxh,openxal/openxal,EuropeanSpallationSource/openxal,luxiaohan/openxal-csns-luxh