Do not try to manually create a wx.PaintEvent

Since wxWidgets 3.1.4, manually creating a wxPaintEvent is no longer
possible, also see commit 3761507882 ("wxObjectDataPtr, wxGridCell*Ptr,
and other changes needed for updated wxWidgets").

unittests/test_event.py

@@ -116,9 +116,6 @@ class Events(wtc.WidgetTestCase):
     def test_NotifyEvent_ctor(self):
         evt = wx.NotifyEvent()
 
-    def test_PaintEvent_ctor(self):
-        evt = wx.PaintEvent()
-
     def test_PaletteChangedEvent_ctor(self):
         evt = wx.PaletteChangedEvent()