Revert "Auto detect mode suffix in hook keyword"

This reverts commit 8bad61f.

Author: jwiegley

use-package-core.el

@@ -1305,10 +1305,7 @@ meaning:
                               (setq every nil)))
                           every))))
          #'use-package-recognize-function
-         (if (string-suffix-p "-mode" (symbol-name name))
-             name
-           (intern (concat (symbol-name name) "-mode")))
-         label arg))))
+         name label arg))))
 
 (defalias 'use-package-autoloads/:hook 'use-package-autoloads-mode)