Disable lazy loading for `winner-mode`

Lazy loading of `winner-mode` breaks `ediff` and
`winner-undo`. As a hotfix I have deactivated
lazy loading for that package for now.

Just activating `winner-mode` after `winner-undo`
or `winner-redo` has been called does not solve
the issues described in #12582.

layers/+spacemacs/spacemacs-defaults/packages.el

@@ -436,8 +436,8 @@
   (use-package winner
     :commands (winner-undo winner-redo)
     :init
+    (winner-mode t)
     (with-eval-after-load 'winner
-      (winner-mode t)
       (setq spacemacs/winner-boring-buffers '("*Completions*"
                                               "*Compile-Log*"
                                               "*inferior-lisp*"