Playerbot: save bots on logout so quests/progress persist

LogoutBot called LogoutPlayer(false), which skips SaveToDB — a quest pushed
and progressed this session was lost on logout unless a 15-min autosave
happened to fire first. Bots then couldn't complete the quest the player
finished, breaking the chain (follow-up quest un-pushable). Use
LogoutPlayer(true), matching the BotSession idle-timeout path.

src/modules/PlayerbotV2/Session/BotSessionMgr.cpp

@@ -106,7 +106,13 @@ bool BotSessionMgr::LogoutBot(ObjectGuid playerGuid)
             bot->RemovePet(pet, PET_SAVE_AS_DELETED, false);
         if (bot->GetGroup())
             bot->RemoveFromGroup();
-        sess->LogoutPlayer(false);
+        // save=true so quest status / progress pushed this session persists
+        // across logout. `false` here skipped SaveToDB entirely — a recently
+        // pushed quest (and its progression) was lost unless a 15-min
+        // autosave happened to fire first, which broke quest chains: bots
+        // couldn't complete the quest the player finished, so the follow-up
+        // quest couldn't be pushed.
+        sess->LogoutPlayer(true);
     }
     // else: login in flight — removing from sessions_ is enough to abort tracking
     return true;