JS: force UnitTypeInput to provide a default value by removing constructor
JS: force UnitTypeInput to provide a default value by removing constructor

Force setting a default unitType for this input instead of accepting Unit.class
as a default.

Signed-off-by: Harvey Harrison <eadbd6b462bf3c97df0300a934c12bc2e5d1fe51@ausenco.com>

jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim