[web] make sure MODE_SPREADSHEET_MULTIVARSTATS is in default spreadsheet toolbar

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37109 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
removed unused code (IS_PRE_RELEASE)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37110 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
removed unused code (IS_PRE_RELEASE)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37111 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
removed unused code (IS_PRE_RELEASE)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37112 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
removed unused code (IS_PRE_RELEASE)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37113 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e