bug#50299: The check-tests-true lint check is incorrect for Emacs packages

[Maxim Cournoyer]

Hi,

The emacs-build-system has its #:tests? argument set to #f by default,
which means users must explicitly specify its value as #t to enable test
suites.

The check-tests-true lint check seems to ignore this and goes on to
recommend, for example:

--8<---------------cut here---------------start------------->8---
gnu/packages/emacs-xyz.scm:15998:7: emacs-groovy-modes@2.0-0.99eaf70: #:tests? 
must not be explicitly set to #t
--8<---------------cut here---------------end--------------->8---

which is wrong.

Thanks,

Maxim