actuator outputs: always add reverse range param

and remove the possibility to set min > max to reverse.

Initially the idea was to add the checkbox on the UI side, to avoid adding
another param, but I don't think I'll go through the extra effort on the
QGC side.

validation/module_schema.yaml

@@ -251,9 +251,6 @@ actuator_output:
                   function:
                       type: string
                       allowed: [ enable ]
-        add_reverse_range_param:
-            # Add a separate range reversing bitmask param.
-            type: boolean
         output_groups:
             type: list
             minlength: 1