fix(doom-dashboard): hide benchmark until available

The dashboard has a chance to display before doom-init-time is
calculated. To prevent the resulting type error, hide it until it is
ready.

modules/ui/doom-dashboard/config.el

@@ -445,6 +445,7 @@ What it is set to is controlled by `+doom-dashboard-pwd-policy'."
                            ?\n)))))
 
 (defun doom-dashboard-widget-loaded ()
+  (when doom-init-time
     (insert
      "\n\n"
      (propertize
@@ -452,7 +453,7 @@ What it is set to is controlled by `+doom-dashboard-pwd-policy'."
        +doom-dashboard--width
        (doom-display-benchmark-h 'return))
       'face 'doom-dashboard-loaded)
-   "\n"))
+     "\n")))
 
 (defun doom-dashboard-widget-shortmenu ()
   (let ((all-the-icons-scale-factor 1.45)