Remove universal=True from bindings in 5x5

Not only has universal not changed to priority, these bindings are on the
screen and so have priority anyway. This means we can safely go back to how
5x5 was prior to 0.6.0.

Author: davep

examples/five_by_five.py

@@ -166,10 +166,10 @@ class Game(Screen):
         Binding("n", "new_game", "New Game"),
         Binding("question_mark", "push_screen('help')", "Help", key_display="?"),
         Binding("q", "quit", "Quit"),
-        Binding("up,w,k", "navigate(-1,0)", "Move Up", False, universal=True),
-        Binding("down,s,j", "navigate(1,0)", "Move Down", False, universal=True),
-        Binding("left,a,h", "navigate(0,-1)", "Move Left", False, universal=True),
-        Binding("right,d,l", "navigate(0,1)", "Move Right", False, universal=True),
+        Binding("up,w,k", "navigate(-1,0)", "Move Up", False),
+        Binding("down,s,j", "navigate(1,0)", "Move Down", False),
+        Binding("left,a,h", "navigate(0,-1)", "Move Left", False),
+        Binding("right,d,l", "navigate(0,1)", "Move Right", False),
         Binding("space", "move", "Toggle", False),
     ]
     """The bindings for the main game grid."""