move text_backend initialization into the shell plugin

Whether a input method is used should be the responsibility
of the shell because some shells may not want to implement
an input method at all

Signed-off-by: Murray Calavera <murray.calavera@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

ivi-shell/ivi-shell.c

@@ -423,6 +423,9 @@ module_init(struct weston_compositor *compositor,
 	if (input_panel_setup(shell) < 0)
 		goto out_settings;
 
+	if (text_backend_init(compositor) < 0)
+		goto out_settings;
+
 	if (wl_global_create(compositor->wl_display,
 			     &ivi_application_interface, 1,
 			     shell, bind_ivi_application) == NULL)