Playerbot: skip grouped bots for ALL kill/NPC-click credit (fix double count)

The core's party-share credits every grouped bot for BOTH combat kills AND
NPC-click objectives (Fear No Evil click fires OnKillCredit for each grouped
bot once, guid empty or not). The empty-guid special case pushed to all bots
and double-counted. Simplify: skip grouped bots unconditionally (the core
handles them); only ungrouped owned bots need the module push.

src/modules/PlayerbotV2/PlayerbotV2.cpp

@@ -3225,18 +3225,13 @@ void Module::OnKillCredit(Player* player, uint32 entry, ObjectGuid guid)
         if (bot->GetMapId() != player->GetMapId())
             continue;
 
-        // A real combat kill carries a creature guid and is ALREADY shared to
-        // grouped bots by the core's party system — pushing again double-
-        // counts the objective. So for combat kills (guid non-empty) skip
-        // grouped bots; the core handles them, and only ungrouped bots need
-        // the module push.
-        //
-        // An NPC-click credit (e.g. quest 63447 "Fear No Evil" — clicking
-        // Injured Stormwind Infantry via a spell script) passes guid EMPTY
-        // (0000000000000000): it is single-caster and NOT reliably shared to
-        // party members (range/phase dependent). For those, push to ALL owned
-        // in-world bots regardless of group so nobody misses a click.
-        if (!guid.IsEmpty() && og && og->IsMember(bot->GetGUID()))
+        // Grouped bots are ALREADY credited by the core's party-share for BOTH
+        // combat kills (valid creature guid) and NPC-click credits (empty guid,
+        // e.g. Fear No Evil) — observed: clicking Injured Stormwind Infantry
+        // fires OnKillCredit for every grouped bot once. Pushing again to a
+        // grouped bot double-counts the objective. Only bots NOT in the
+        // owner's group need the module push.
+        if (og && og->IsMember(bot->GetGUID()))
             continue;
 
         bot->KilledMonsterCredit(entry, guid);