Remove unnecessary XS-Testsuite field in debian/control.

Jelmer Vernooijrequested to merge
jelmer/cfitsio:xs-testsuite-field-in-debian-control into master

Remove unnecessary XS-Testsuite field in debian/control.

Fixes lintian: xs-testsuite-field-in-debian-control See https://lintian.debian.org/tags/xs-testsuite-field-in-debian-control.html for more details.

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