SvxOpaqueItem takes a sal_uInt16 nId as first argument

This code was like that ever since 84a3db80
"initial import."  From other uses of SvxOpaqueItem, the best bet appears to be
RES_OPAQUE.

Change-Id: I19de8fac4f41716d9c2a73bda4a8cea200ae99f8

sw/source/core/doc/DocumentStylePoolManager.cxx

@@ -1318,7 +1318,7 @@ SwFmt* DocumentStylePoolManager::GetFmtFromPool( sal_uInt16 nId )
             aSet.Put( SwFmtAnchor( FLY_AT_PAGE ));
             aSet.Put( SwFmtHoriOrient( 0, text::HoriOrientation::CENTER, text::RelOrientation::FRAME ));
             aSet.Put( SwFmtVertOrient( 0, text::VertOrientation::CENTER, text::RelOrientation::FRAME ));
-            aSet.Put( SvxOpaqueItem( sal_False ));
+            aSet.Put( SvxOpaqueItem( RES_OPAQUE, false ));
             aSet.Put( SwFmtSurround( SURROUND_THROUGHT ));
         }
         break;