[gnome-tweak-tool] Remove deprecation warnings

[Gian Mario Tagliaretti <gianmt src gnome org>]

commit 22316db9234aba93959186ee141a97753f356753
Author: Gian Mario Tagliaretti <gianmt gnome org>
Date:   Mon Sep 22 14:19:28 2014 +0100

    Remove deprecation warnings
    
    Remove some deprecation warnings on MessageDialog using the new keywords

 gtweak/tweaks/tweak_group_shell_extensions.py |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtweak/tweaks/tweak_group_shell_extensions.py b/gtweak/tweaks/tweak_group_shell_extensions.py
index a2644da..ba82bf7 100644
--- a/gtweak/tweaks/tweak_group_shell_extensions.py
+++ b/gtweak/tweaks/tweak_group_shell_extensions.py
@@ -140,10 +140,10 @@ class _ShellExtensionTweak(Gtk.ListBoxRow, Tweak):
             first_message = _("Uninstall Extension")
             second_message = _("Do you want to uninstall the '%s' extension?") % name
             dialog = Gtk.MessageDialog(
-                                   self.main_window,0,
-                                   type=Gtk.MessageType.QUESTION,
+                                   transient_for=self.main_window, flags=0,
+                                   message_type=Gtk.MessageType.QUESTION,
                                    buttons=Gtk.ButtonsType.YES_NO,
-                                   message_format=first_message)
+                                   text=first_message)
             dialog.format_secondary_text(second_message)
             response = dialog.run()
             if response == Gtk.ResponseType.YES: