[PyQt] Small fix

[Julio César Gázquez]

Hello.

This is a small patch fixing setItemDelegateForColumn and 
setItemDelegateForColumn.

I can't test it (my build is broken, I got a "QWidget: Must construct a 
QApplication before a QPaintDevice"), but this patch makes those currently 
broken functions like the similar, but working setItemDelegate.

As a workaround, keeping around a reference of a delegate (so the C++ object 
isn't destroyed along the Python one) the functions work as intended.

Best regards.

-- 
Julio César Gázquez - Ingeniero en Sistemas
Igneo Soluciones
Redes - Asesoramiento - Desarrollos y Sistemas
www.igneosoluciones.com.ar - Tel: (341)-155-705517
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