fdo#66288: fix MetaAction::Read()

This is "collateral damage" from the actual bug, and is broken since CVS
initial import (which likely means that in practice no bare MetaActions
exist), but the MetaAction::Read() must not read the type from the
stream since MetaAction::ReadMetaAction() has already done that!

Change-Id: I9ab06ec3112c1eefb86ab70ddfa2f588af257b88

vcl/source/gdi/metaact.cxx

@@ -144,9 +144,9 @@ void MetaAction::Write( SvStream& rOStm, ImplMetaWriteData* )
 
 // ------------------------------------------------------------------------
 
-void MetaAction::Read( SvStream& rIStm, ImplMetaReadData* )
+void MetaAction::Read( SvStream&, ImplMetaReadData* )
 {
-    rIStm >> mnType;
+    // DO NOT read mnType - ReadMetaAction already did that!
 }
 
 // ------------------------------------------------------------------------