refresh when canvas_size_limits are changed (napari#6834)

# References and relevant issues
If you change `canvas_size_limits` programmatically, nothing happens.
You need to interact with the canvas. 
This is a bit confusing when using a notebook, ipython, etc. because it
appears it doesn't work or the size limits are not correct.

# Description
Uses `self.node.update()` in ` _on_canvas_size_limits_change`

---------

Co-authored-by: Lorenzo Gaifas <[email protected]>

napari/_vispy/layers/points.py

@@ -204,6 +204,7 @@ def _on_canvas_size_limits_change(self):
             low + scaled_highlight,
             high + scaled_highlight,
         )
+        self.node.update()
 
     def reset(self):
         super().reset()