(fix): autoloaded commands load org-roam-mode (#712)

Users should not have to explicitly enable the minor mode before using
autoloaded commands.

org-roam-graph.el

@@ -37,8 +37,10 @@
 
 ;;;; Declarations
 (defvar org-roam-directory)
+(defvar org-roam-mode)
 (declare-function org-roam--org-roam-file-p  "org-roam")
 (declare-function org-roam--path-to-slug     "org-roam")
+(declare-function org-roam-mode              "org-roam")
 
 ;;;; Options
 (defcustom org-roam-graph-viewer (executable-find "firefox")
@@ -283,6 +285,7 @@ ARG may be any of the following values:
   - `\\[universal-argument]' -   build the graph for FILE.
   - `\\[universal-argument]' -N  build the graph for FILE limiting nodes to N steps."
   (interactive "P")
+  (unless org-roam-mode (org-roam-mode))
   (let ((file (or file (buffer-file-name (buffer-base-buffer)))))
     (unless (or (not arg) (equal arg '(16)))
       (unless file