Fix for slider hit testing

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33779 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Revert: Fix for slider hit testing

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33780 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e