This was never a documented feature, but happended to work before Qt 5.5.
It broke because the peoperty access went into the static function and are
now prefixed with '_t->'
So restore the behavior as it was by not including the parentheses in the
member name.
Task-number: QTBUG-47695
Change-Id: Ic3509ddea7ac9abc871e71f5bfbe81d04d08e9bc
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@theqtcompany.com>
