tests/test_docker_warning.py: Fix error due to file name refactor

Author: manu-chroma

tests/test_docker_warning.py

@@ -8,8 +8,8 @@
 class TestDefaultDockerWarning(unittest.TestCase):
 
     # Test to check warning when default docker Container is used on Windows
-    @mock.patch("cwltool.draft2tool.onWindows",return_value = True)
-    @mock.patch("cwltool.draft2tool._logger")
+    @mock.patch("cwltool.tool.onWindows",return_value = True)
+    @mock.patch("cwltool.tool._logger")
     def test_default_docker_warning(self,mock_logger,mock_windows):
 
         class TestCommandLineTool(CommandLineTool):