Fixing giac code to report "generically true" property instead of "geometrically true" (untested due to giac input conversion problem)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26767 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #166: quick fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26768 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e