The flags argument is intended to support multiple flags from the
ArgumentFlags enum. Therefore, flags cannot be of enum type, it
must be an integral type that allows flags to be OR'ed together.
Update the one call site that was erroneously OR'ing multiple values
but then casting that to an ArgumentFlags, which could result in
passing a technically invalid value.

Amends: dd3482f6 (cmTargetPropCommandBase: Restore
ArgumentFlags enum value bool logic, 2022-11-27)