Revert "Skip our test for settrace too"

Transient should no longer be happening
This reverts commit 3c42e3c.

Author: Adam Hrbac

graalpython/com.oracle.graal.python.test/src/tests/test_sys_settrace.py

@@ -156,7 +156,6 @@ def test_case(self):
     return test_case
 
 @unittest.skipIf(skip, 'sys.settrace only works in the bytecode interpreter')
-@unittest.skipIf(True, 'Disabled due to GR-40754')
 class TraceTests(unittest.TestCase):
     def trace(self, frame, event, arg):
         code = frame.f_code