Dont include stack trace test in valgrind.

tests/ExceptionTests.cpp

@@ -3,7 +3,7 @@
 #include "../src/Exception.hpp"
 using namespace ArbUt;
 
-TEST_CASE("Throw exception, get stack trace") {
+TEST_CASE("Throw exception get stack trace") {
     try {
         throw ArbUt::Exception("foobar");
     }