Pin which-key to gnu and remove redundant declaration.

Similarly to `use-package` and `diminish` the `which-key` seems to has moved to
GNU ELPA.

modules/init-help.el

@@ -14,6 +14,8 @@
 
 ;;; Which Key - display available keybindings in popup.
 (use-package which-key
+  :if exordium-enable-which-key
+  :pin gnu
   :diminish
   :config
   (which-key-mode))

modules/init-lsp.el

@@ -101,11 +101,6 @@
   (dap-tooltip-mode 1)
   :commands dap-mode)
 
-(use-package which-key
-  :if exordium-enable-which-key
-  :config
-  (which-key-mode))
-
 
 ;; ;; Terrible hack working around off by one error between TRAMP and lsp-mode
 ;; (defun lsp--make-message@override (params)