0022712: [CEA 1300] LightApp_PreferencesDlg - invalid layout / resize policy
0022712: [CEA 1300] LightApp_PreferencesDlg - invalid layout / resize policy

Fix improper applying of "stretch" property in case if frame pref item is scrollable"

FedoraScientific/salome-gui,FedoraScientific/salome-gui,FedoraScientific/salome-gui,FedoraScientific/salome-gui,FedoraScientific/salome-gui,FedoraScientific/salome-gui