Scripts/Quest: make Wounded Skirmisher reply talk show class & race (#22936)

Quest 12288: Overwhelmed!
- Upon casting the healing quest spell, Wounded Skirmisher (npc_wounded_skirmisher)
  shows $r and $c in their reply talk text because of the missing target argument,
  hence not targeting the player on the quest (or the specific caster, in this case).

Text used by the NPC Wounded Skirmisher:
    0  Ahh.... better.
    1  Whoa - I nearly died there. Thank you, $r!
    2  Thank you, $c.

Solution: add the missing target name, caster, to the Talk() script line.
(cherry picked from commit 95398fadf9)

src/server/scripts/Northrend/zone_grizzly_hills.cpp

@@ -499,7 +499,7 @@ public:
                 && caster->ToPlayer()->GetQuestStatus(QUEST_OVERWHELMED) == QUEST_STATUS_INCOMPLETE)
             {
                 DoCast(caster, SPELL_KILL_CREDIT);
-                Talk(SAY_RANDOM);
+                Talk(SAY_RANDOM, caster);
                 if (me->IsStandState())
                     me->GetMotionMaster()->MovePoint(1, me->GetPositionX()+7, me->GetPositionY()+7, me->GetPositionZ());
                 else