layers: Fix missing owner for some layers

This is a partial fix for #3493. I didn't touch layers where I can't
tell what the intention was for how it should work.

layers/+lang/nim/packages.el

@@ -8,6 +8,8 @@
 (defun nim/post-init-company ()
   (spacemacs|add-company-hook nim-mode))
 
+(defun nim/init-company-nim ())
+
 (defun nim/post-init-flycheck ()
   (spacemacs/add-flycheck-hook 'nim-mode))
 

layers/+lang/racket/packages.el

@@ -1,7 +1,7 @@
 (setq racket-packages
   '(
     company
-    company-quickhelp-mode
+    company-quickhelp
     racket-mode
     ))
 

layers/semantic/packages.el

@@ -10,15 +10,13 @@
 ;;
 ;;; License: GPLv3
 
-(defvar semantic-packages
-  '(
-    ;; package semantic go here
-    semantic
-    srefactor
-    stickyfunc-enhance
-    )
-  "List of all packages to install and/or initialize. Built-in packages
-which require an initialization must be listed explicitly in the list.")
+(setq semantic-packages
+      '(
+        ;; package semantic go here
+        semantic
+        ;; srefactor
+        stickyfunc-enhance
+        ))
 
 (unless (version< emacs-version "24.4")
   (add-to-list 'semantic-packages 'srefactor))