Lucky numbers draw button should be disabled in cooldown periods

[hantuzun]

In case there is more than 5 seconds until a new button can be drawn:

• Show the cooldown timer.
• Disable the button. Else:
• The current behavior.

I think we can have a 5 seconds buffer as it takes a couple of seconds to interact with MetaMask and then wait for the tx to be included in a block.