[epiphany] prefs-dialog: Fix script message handler name in _finalize()

[Gabriel Ivașcu <gabrielivascu src gnome org>]

commit a387ace44d54ad51a1dd01a6f1c6f2f2f3480100
Author: Gabriel Ivascu <ivascu gabriel59 gmail com>
Date:   Wed Jul 5 16:21:49 2017 +0300

    prefs-dialog: Fix script message handler name in _finalize()
    
    The handler has been renamed in commit bc2af30

 src/prefs-dialog.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/prefs-dialog.c b/src/prefs-dialog.c
index 9c9efc0..4b4761f 100644
--- a/src/prefs-dialog.c
+++ b/src/prefs-dialog.c
@@ -227,7 +227,7 @@ prefs_dialog_finalize (GObject *object)
 #if ENABLE_FIREFOX_SYNC
   if (dialog->fxa_web_view != NULL) {
     webkit_user_content_manager_unregister_script_message_handler (dialog->fxa_manager,
-                                                                   "accountsCommandHandler");
+                                                                   "toChromeMessageHandler");
     webkit_user_script_unref (dialog->fxa_script);
     g_object_unref (dialog->fxa_manager);
   }