Fix off animation

animation.py

@@ -21,7 +21,7 @@ class Off(Animation):
         super(Off, self).__init__()
 
     def name(self):
-        return "Off"
+        return "off"
 
 
 class Steady(Animation):

dmx.py

@@ -135,6 +135,7 @@ class DMX:
             # one frame black
             self._animation = Steady((0, 0, 0))
             self.update()
+            self._animation = Off()
         else:
             self.start()
         print(f"Animation: {animation}", file=sys.stderr)