fix bug: minion enchantment listened to a event + become-of-a-minion

[peter1591]

the event listened by the enchantment should be registered after a new minion became a copy of the minion.

add a new test:

1. minion: gain +1/+1 after turn end
2. faceless manipulator: become the minion
3. turn end
4. check both gained +1/+1

[peter1591]

Note: if this is implemented as an aura, then no bug exists

But remember, there are still some enchantments which listen to an event For example: when the minion attacks, draw a card

[peter1591]

Fixed in commit: b2f0aac7