DB/Spell: Magma Totem shouldn't generate threat

By Jildor, closes #21178

sql/updates/world/3.3.5/2018_01_18_02_world_335.sql

@@ -0,0 +1,9 @@
+DELETE FROM `spell_custom_attr` WHERE `entry` IN (8187,10579,10580,10581,25550,58732,58735);
+INSERT INTO `spell_custom_attr` (`entry`,`attributes`) VALUES
+(8187, 0x10),
+(10579,0x10),
+(10580,0x10),
+(10581,0x10),
+(25550,0x10),
+(58732,0x10),
+(58735,0x10);