Scripts/Quests: Fix Red Snapper - Very Tasty! GOb

Fix 'School of Red Snapper' now disappear correctly when using 'Draenei Fishing Net', the bug is caused because the GameObject is SpellFocus type.

Fix: #1673
The ConditionScript is necessary?

Really not work properly because it can damage a distance of about 4 yards, the Dummy effect is applied, but the ActiveObject is not applied.

In addition you should use the GetRespawnTime () because it never goes away, the object can only disappear visibly, but not completely, so visibly disappear, but players can keep the cast.