fix delete in MultiSelection::SetTotalRange

leftover from conversion to using std::vector<Range> instead of
std::vector<Range*>

Change-Id: Iaa2d81b0fac4551f4d1ed685d1e728d5e0ea6929
Reviewed-on: https://gerrit.libreoffice.org/62644
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

tools/source/memtools/multisel.cxx

@@ -423,7 +423,6 @@ void MultiSelection::SetTotalRange( const Range& rTotRange )
     {
         if( pRange->Max() < aTotRange.Min() )
         {
-            delete pRange;
             aSels.erase( aSels.begin() );
         }
         else if( pRange->Min() < aTotRange.Min() )