Fix tests when run in Windows

Author: HelioGuilherme66

utest/editor/test_z_kweditor_plugin.py

@@ -322,7 +322,7 @@ def test_disable(self):
     """
 
     # This was failing at AppVeyor
-    @pytest.mark.skipif(IS_WINDOWS, reason="On Windows causes: Windows fatal exception: access violation")
+    @pytest.mark.skipif(sys.platform=='win32', reason="On Windows causes: Windows fatal exception: access violation")
     def test_show(self):
         # self.setup_data()
         # self.frame.Show()