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
I tried with ConditionScript, but when the gameobject is in "respawn" does not verify the OnConditionCheck of ConditionScript.