WaE: enumeration value not handled in switch

So just switch on the integer value instead. Whether the missing enumerations
can occur here and whether not handling them causes a bug or not, I don't
know.

Change-Id: Ib96b855739e8a1e92f72a88c3f6f106d86989d23

sd/source/filter/eppt/pptx-text.cxx

@@ -878,7 +878,7 @@ void ParagraphObj::ImplGetNumberingLevel( PPTExBulletProvider& rBuProv, sal_Int1
                 PortionObj* pPortion = front();
                 CalculateGraphicBulletSize( ( pPortion ) ? pPortion->mnCharHeight : 24 );
 
-                switch( (SvxExtNumType)nNumberingType )
+                switch( nNumberingType )
                 {
                     case SVX_NUM_NUMBER_NONE : nParaFlags |= 0xf; break;