ocarina: Don't do gtk locking anymore

I added this to help with setting album art in other threads.  Now that
I'm forcing this to the main thread, I don't think I need it anymore.

ocarina/__init__.py

@@ -30,6 +30,4 @@ def run():
 	body.footer.set_art("images/ocarina.png")
 	libsaria.startup()
 	print "Startup took:", uptime()
-	gtk.threads_enter()
 	gtk.main()
-	gtk.threads_leave()

ocarina/body/image.py

@@ -48,10 +48,8 @@ class FileImage(gtk.Image):
 		if path != self.path:
 			self.path   = path
 			self.height = height
-			gtk.threads_enter()
 			self.set_from_file(path)
 			resize(self, height)
-			gtk.threads_leave()
 
 	def tooltip(self, image, x, y, keyboard, tip):
 		image = gtk.Image()