example/plateformer: also pause asset animation

examples/gameplay/plateform/actors/player.lua

@@ -26,6 +26,7 @@ function Player:update(dt)
 
   if self.keys["start"].isPressed then
     self.world:switchActivity()
+    self.assets:switchActivity()
     self.scene:flushKeys()
   end
 

examples/gameplay/plateform/init.lua

@@ -41,6 +41,7 @@ end
 function Plateformer:update(dt)
   if (self.world.isActive == false) and self.sources[1].keys["start"].isPressed then
     self.world:switchActivity()
+    self.assets:switchActivity()
   end
 end