Change all volume buttons

All existing volume buttons must be changed when the volume changes, not
just the one receiving the value-changed signal.

libsaria/music/audio.py

@@ -108,3 +108,4 @@ def set_volume(prcnt):
 	global player
 	player.set_property("volume", prcnt)
 	libsaria.prefs["volume"] = prcnt
+	return prcnt

ocarina/button.py

@@ -88,8 +88,12 @@ class VolumeButton(gtk.VolumeButton):
 		self.resize()
 
 		self.connect("value-changed", self.changed)
+		LS.event.invite("POSTSETVOLUME", self.set_slider)
 		self.show()
 
+	def set_slider(self, prcnt):
+		self.set_value(prcnt)
+
 	def resize(self):
 		image = self.get_children()[0]
 		icon = image.get_icon_name()[0]