Remove 'template' from call to get_kernel method of kernel bundle in sorting

[ndgrigorian]

This PR removes an unnecessary templating of the get_kernel method of the kernel bundle in sort.hpp.

As no template parameter was given, this not only did not do anything, but was causing nightly builds to fail.

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[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[coveralls]

coverage: 87.968%. remained the same
when pulling a8769c6 on remove-unnecessary-templated-method
into f3c2975 on master.

[antonwolfy]

LGTM!