[s2042] Fix duplicate entry issue added in [s2034]

Signed-off-by: Xfurry <xfurry@scriptdev2.com>

(based on commit [12530] - f9573a0)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[s2043] Implement the spells used in the Chess Event encounter

Combat spell entries: 37775, 37824, 39338, 39342, 39341, 39344, 45260
Melee spells: 37142, 37143, 37147, 37149, 37150, 37220, 37227, 37228, 37337, 37339, 37345, 37348
Chess movement spells: 30012, 32312, 37388, 30284, 37144, 37146, 37148, 37151, 37152, 37153
Aura stacking exception: 32261 and 39400

(based on commit [12531] - 3a57de2)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[s2044] Cody Style Improvements

Also remove an unused variable (thanks to Den for this!)

(based on commit [12532] - b1f227c)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>