Resolves: fdo#54862 extra ++n causing merged cells to be skipped

commit 567c1db2 reverted a pile
of other commits, including 858b5b4f
but didn't revert the ++n of that commit, leading to merge groups
getting skipped

Change-Id: Ie2b46ebc433df636ebe0092f4a992631b7f06a3f

sw/source/filter/ww8/ww8par2.cxx

@@ -2752,7 +2752,6 @@ void WW8TabDesc::FinishSwTable()
                                                nRowSpan :
                                              ((-1) * (nRowSpan - n));
                     pCurrentBox->setRowSpan( nRowSpanSet );
-                    ++n;
                 }
             }
         }