fix missing inverse definitions in generate_basis_approximations
(backport #13517)
#13964
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Summary
This tiny PR fixes an oversight in the generation routine for basis approximations that is used in the SolovayKitaev synthesis pass.
Details and comments
While the dictionary of single-qubit gates listed the
sx
andsxdg
gates, the dictionary of inverses was missing those definitions.This PR simply adds the respective definitions.
Should this receive a release note?
This is an automatic backport of pull request #13517 done by [Mergify](https://mergify.com).