Rewrote `vector::ops::transformations::tests::test_simplify_preserve_topology`...

[metasim]

...to be less sensitive to GEOS changes.

• [X] I agree to follow the project's code of conduct.

• [X] I added an entry to CHANGES.md if knowledge of this change could be valuable to users.

This change replicates the test used in OSGeo/gdal for this feature rather than attempts a more challenging test:

https://github.com/OSGeo/gdal/blob/b33e3b318b6cf43d5ccfa35e1ad0e5e22313d09f/autotest/ogr/ogr_geos.py#L327

Closes #443

[lnicola]

bors r+

[bors[bot]]

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• ci gdal-3.1.3
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