Delete scalar_image_function_inspector_old.py

[aaronayres35]

Problem Description
the example examples/demo/advanced/scalar_image_function_inspector_old.py is currently broken (it fails immediately when you try to run it). Additionally, there exists examples/demo/advanced/scalar_image_function_inspector.py that appears to have the same goal which works fine. We should either fix the old example or delete it entirely. I am unclear why both have been kept.

Reproduction Steps:

python examples/demo/advanced/scalar_image_function_inspector_old.py 

Expected behavior:

Example should run or not exist

This is the current failure I see:

Details

$ python examples/demo/advanced/scalar_image_function_inspector_old.py 
2021-04-02 15:07:32.391 Python[96648:17304441] ApplePersistenceIgnoreState: Existing state will not be touched. New state will be written to (null)
Traceback (most recent call last):
  File "/Users/aayres/.edm/envs/chaco-test-3.6-pyqt5/lib/python3.6/site-packages/enable/qt4/base_window.py", line 243, in paintEvent
    self.handler.paintEvent(event)
  File "/Users/aayres/.edm/envs/chaco-test-3.6-pyqt5/lib/python3.6/site-packages/enable/qt4/base_window.py", line 78, in paintEvent
    self._enable_window._paint(event)
  File "/Users/aayres/.edm/envs/chaco-test-3.6-pyqt5/lib/python3.6/site-packages/enable/abstract_window.py", line 506, in _paint
    self.component.draw(gc, view_bounds=(0, 0, size[0], size[1]))
  File "/Users/aayres/.edm/envs/chaco-test-3.6-pyqt5/lib/python3.6/site-packages/enable/component.py", line 432, in draw
    self._draw(gc, view_bounds, mode)
  File "/Users/aayres/.edm/envs/chaco-test-3.6-pyqt5/lib/python3.6/site-packages/enable/component.py", line 813, in _draw
    self._dispatch_draw(layer, gc, view_bounds, mode)
  File "/Users/aayres/.edm/envs/chaco-test-3.6-pyqt5/lib/python3.6/site-packages/enable/container.py", line 280, in _dispatch_draw
    component._dispatch_draw(layer, gc, new_bounds, mode)
  File "/Users/aayres/.edm/envs/chaco-test-3.6-pyqt5/lib/python3.6/site-packages/enable/container.py", line 278, in _dispatch_draw
    component._draw(gc, new_bounds, mode)
  File "/Users/aayres/.edm/envs/chaco-test-3.6-pyqt5/lib/python3.6/site-packages/enable/component.py", line 803, in _draw
    self._dispatch_draw(layer, bb, view_bounds, mode)
  File "/Users/aayres/.edm/envs/chaco-test-3.6-pyqt5/lib/python3.6/site-packages/enable/container.py", line 280, in _dispatch_draw
    component._dispatch_draw(layer, gc, new_bounds, mode)
  File "/Users/aayres/.edm/envs/chaco-test-3.6-pyqt5/lib/python3.6/site-packages/enable/component.py", line 831, in _dispatch_draw
    handler(gc, view_bounds, mode)
  File "/Users/aayres/Desktop/chaco/chaco/base_2d_plot.py", line 200, in _draw_image
    self._render(gc)
  File "/Users/aayres/Desktop/chaco/chaco/contour_poly_plot.py", line 46, in _render
    self._update_polys()
  File "/Users/aayres/Desktop/chaco/chaco/contour_poly_plot.py", line 86, in _update_polys
    c = Cntr(xg, yg, data, ~mask)
ValueError: Arguments x, y, z, mask (if present) must have the same dimensions.
Abort trap: 6