Correct the detection of emacsclient

* exwm.el (exwm-enable): Use `daemonp' instead of `display-graphic-p'.

exwm.el

@@ -726,11 +726,10 @@
      ;; Ignore unrecognized command line arguments.  This can be helpful
      ;; when EXWM is launched by some session manager.
      (push #'vector command-line-functions)
-     (if (display-graphic-p)
-         ;; emacs.
-         (add-hook 'window-setup-hook #'exwm-init t)
-       ;; emacsclient.
-       (add-hook 'after-make-frame-functions #'exwm-init t))
+     (add-hook (if (daemonp)
+                   'after-make-frame-functions ;emacsclient
+                 'window-setup-hook)           ;emacs
+               #'exwm-init t)
      (add-hook 'kill-emacs-hook #'exwm--server-stop)
      (dolist (i exwm-blocking-subrs)
        (advice-add i :around #'exwm--server-eval-at)))))