Hotfixes for setting default cursor back on Mac when file IO is unsuccessful

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28495 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Web: scale touch events the same way Mouse events are scaled

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28497 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e