Fix getOpenFileName/getSaveFileName signatures.
Fix getOpenFileName/getSaveFileName signatures.

Reviewer: Renato Araújo <16af9705e5a16d85aed275f2f9e8171326ec17f6@openbossa.org>
          Marcelo Lira <marcelo.lira@openbossa.org>

BadSingleton/pyside2,PySide/PySide,M4rtinK/pyside-android,pankajp/pyside,RobinD42/pyside,enthought/pyside,IronManMark20/pyside2,gbaty/pyside2,M4rtinK/pyside-bb10,enthought/pyside,RobinD42/pyside,RobinD42/pyside,BadSingleton/pyside2,PySide/PySide,M4rtinK/pyside-bb10,gbaty/pyside2,M4rtinK/pyside-android,qtproject/pyside-pyside,BadSingleton/pyside2,M4rtinK/pyside-bb10,IronManMark20/pyside2,M4rtinK/pyside-android,M4rtinK/pyside-android,PySide/PySide,gbaty/pyside2,M4rtinK/pyside-bb10,qtproject/pyside-pyside,enthought/pyside,enthought/pyside,IronManMark20/pyside2,gbaty/pyside2,BadSingleton/pyside2,RobinD42/pyside,M4rtinK/pyside-android,pankajp/pyside,enthought/pyside,PySide/PySide,pankajp/pyside,qtproject/pyside-pyside,IronManMark20/pyside2,RobinD42/pyside,IronManMark20/pyside2,M4rtinK/pyside-android,RobinD42/pyside,RobinD42/pyside,pankajp/pyside,enthought/pyside,pankajp/pyside,qtproject/pyside-pyside,gbaty/pyside2,PySide/PySide,enthought/pyside,qtproject/pyside-pyside,M4rtinK/pyside-bb10,BadSingleton/pyside2,M4rtinK/pyside-bb10