Use set-company-backend!

Fixes incorrect usage of setq-local in a global context.

modules/lang/racket/config.el

@@ -5,6 +5,8 @@
   :config
   (set-popup-rule! "^\\*Racket REPL" :size 10 :select t)
   (set-repl-handler! 'racket-mode #'+racket/repl)
+  (set-company-backend! 'racket-mode
+    '(company-capf company-abbrev company-dabbrev-code company-dabbrev company-files company-yasnippet))
   (set-lookup-handlers! 'racket-mode
     :definition    #'racket-describe
     :documentation #'racket-doc)
@@ -17,14 +19,6 @@
     :symbols '(("#true" "#false")))
 
   (setq racket-smart-open-bracket-enable t)
-  (when (featurep! :completion company)
-    (setq-local company-backends
-                '(company-capf
-                  company-abbrev
-                  company-dabbrev-code
-                  company-dabbrev
-                  company-files
-                  company-yasnippet)))
 
   (add-hook! racket-mode
     #'(;; 3rd-party functionality