[gnome-tweak-tool] Fix make_image definition

[John Stowers <jstowers src gnome org>]

commit 94bcdf8eadc4630a8cd4c85b7ab013e5fc1ff319
Author: John Stowers <john stowers gmail com>
Date:   Mon Aug 19 11:46:51 2013 +0200

    Fix make_image definition

 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 27f3cb3..8b386d8 100644
--- a/gtweak/tweaks/tweak_group_shell_extensions.py
+++ b/gtweak/tweaks/tweak_group_shell_extensions.py
@@ -72,11 +72,11 @@ class _ShellExtensionTweak(Gtk.ListBoxRow, Tweak):
 
 
         if info:
-            inf = make_image("dialog-information-symbolic", info)
+            inf = self.make_image("dialog-information-symbolic", info)
             self.hbox.pack_start(inf, False, False, 0)
 
         if warning:
-            wg = make_image("dialog-warning-symbolic", warning)
+            wg = self.make_image("dialog-warning-symbolic", warning)
             self.hbox.pack_start(wg, False, False, 0)
 
         if self._shell.SUPPORTS_EXTENSION_PREFS:
@@ -169,7 +169,7 @@ class _ShellExtensionTweak(Gtk.ListBoxRow, Tweak):
         updateButton.show()
         self.hbox.pack_end(updateButton, False, False, 0)
 
-    def make_image(icon, tip):
+    def make_image(self, icon, tip):
         image = Gtk.Image.new_from_icon_name(icon, Gtk.IconSize.MENU)
         image.set_tooltip_text(tip)
         return image