Fix json decoding

Fix minor tooltip issue

Gui.py

@@ -457,7 +457,7 @@ class SpriteSelector(object):
             try:
                 task.update_status("Downloading official sprites list")
                 with urlopen('http://vt.alttp.run/sprites') as response:
-                    sprites_arr = json.load(response)
+                    sprites_arr = json.loads(response.read().decode("utf-8"))
             except Exception as e:
                 resultmessage = "Error getting list of official sprites. Sprites not updated.\n\n%s: %s" % (type(e).__name__, e)
                 successful = False

GuiUtils.py

@@ -109,6 +109,7 @@ class ToolTips(object):
     window = None
     active = 0
     tag = None
+    after_id = None
 
     @classmethod
     def getcontroller(cls, widget):