writerfilter: remove never read m_xTableRange

Its last user was
writerfilter::dmapper::DomainMapperTableHandler::getTable(), removed in
commit 6ea66657 (loplugin:unusedmethods
writerfilter, 2015-07-20).

Change-Id: Ibaf536d4dd8f01f4413c3cec033db7438501e58c

writerfilter/source/dmapper/DomainMapperTableHandler.cxx

@@ -1028,8 +1028,6 @@ void DomainMapperTableHandler::endTable(unsigned int nestedTableLevel, bool bTab
 
                 if (xTable.is())
                 {
-                    m_xTableRange = xTable->getAnchor( );
-
                     if (!aMerges.empty())
                     {
                         // Perform horizontal merges in reverse order, so the fact that merging changes the position of cells won't cause a problem for us.

writerfilter/source/dmapper/DomainMapperTableHandler.hxx

@@ -65,8 +65,6 @@ class DomainMapperTableHandler final
     std::vector<CellSequence_t> m_aRowRanges;
     std::vector<RowSequence_t> m_aTableRanges;
 
-    css::uno::Reference< css::text::XTextRange >           m_xTableRange;
-
     // properties
     PropertyMapVector2      m_aCellProperties;
     PropertyMapVector1      m_aRowProperties;