Fix Vigilance.

Implements Glyph of Vigilance.
Fixes issue #1134. Thanks Bodompelle for the idea, even thought the fix is rather different.

--HG--
branch : trunk

sql/updates/8319_world_spell_linked_spell.sql

@@ -0,0 +1 @@
+DELETE FROM `spell_linked_spell` WHERE `spell_trigger`=50720;

sql/world.sql

@@ -6006,7 +6006,6 @@ INSERT INTO `spell_linked_spell` (`spell_trigger`,`spell_effect`,`type`,`comment
 ( 32390, 60467, 2, 'Shadow Embrace Rank4'),
 ( 32391, 60468, 2, 'Shadow Embrace Rank5'),
 ( 33206, 44416, 2, 'Pain Suppression (threat)'),
-( 50720, 59665, 0, 'Vigilance (redirect threat)'),
 ( 52610, 62071, 0, 'Savage Roar'),
 (-52610,-62071, 0, 'Savage Roar'),
 ( 51209, 55095, 1, 'Hungering cold - frost fever'),