Fixed bug#66644 (Remove ()'s when rendering methodname in constructorsynopsis/destructorsynopsis)

Hannes's change in be4012c8f9bf7b8a1961e88a7b0f510a3266e9a0 to append ()
to method names took care of not doing it in methodsynopsis, but forgot
constructor/destructorsynopsis.

For example:
public DateTime::__construct() ([ string $time = "now" [, DateTimeZone
$timezone = NULL ]] )

How has no-one noticed this in the last 3 and a half years?