sw: fix another wrong call of SwTxtPortion copy-ctor

Not sure what it should do, but given the parameter is SwLineLayout
it will set POR_LAY on a SwTxtPortion which is wrong.

Change-Id: I4296bcdf9e788338eb007ad09eae675a9fdc6a75

sw/source/core/text/pormulti.cxx

@@ -678,7 +678,7 @@ void SwRubyPortion::_Adjust( SwTxtFormatInfo &rInf )
     if( nLeft || nRight )
     {
         if( !pCurr->GetPortion() )
-            pCurr->SetPortion( new SwTxtPortion( *pCurr ) );
+            pCurr->SetPortion(new SwTxtPortion(*static_cast<SwLinePortion*>(pCurr)));
         if( nLeft )
         {
             SwMarginPortion *pMarg = new SwMarginPortion( 0 );