Get rid of pygtk.require. It doesn't make a lot of sense

and recent apps are not using it anyway.

sugar/presence/Buddy.py

@@ -1,9 +1,8 @@
 import base64
 import logging
 
-import pygtk
-pygtk.require('2.0')
-import gtk, gobject
+import gtk
+import gobject
 
 from sugar.p2p import Stream
 from sugar.p2p import network

sugar/presence/PresenceService.py

@@ -627,7 +627,7 @@ def runTests():
 	runner.run(suite)
 
 def main():
-	import pygtk, gtk
+	import gtk
 	global ps
 	ps = PresenceService.get_instance()
 	ps.start()