Deathknight: fix Control Undead

AURA and INVERT_AURA are not mutually exclusive but complementary
Warlock: fix Enslave Demon

AURA and INVERT_AURA are not mutually exclusive but complementary
Merge pull request #7 from Rainrider/warlock

Warlock: fix Enslave Demon
Merge pull request #6 from Rainrider/deathknight

Deathknight: fix Control Undead