Reset settings when new construction is started in Touch

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26540 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[cas] #3451 fixed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26541 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e