sw_redlinehide_4b: fix wrong assert in AppendObjs()

Clearly this is wrong, the first node might be deleted; triggered e.g.
by ooo69593-1.odt.

Change-Id: I8f491372fcc375e68f2f7611924d8d4c7f673f17

sw/source/core/layout/frmtool.cxx

@@ -1171,7 +1171,7 @@ void AppendObjs(const SwFrameFormats *const pTable, sal_uLong const nIndex,
                     }
                     else
                     {
-                        assert(nIndex == iter->pNode->GetIndex()); // first iteration
+                        assert(pMerged->pParaPropsNode == iter->pNode); // first iteration
                     }
                     pNode = iter->pNode;
                     iterFirst = iter;