game: clear in-flight NPC/GO query sets on disconnect

pendingCreatureQueries and pendingGameObjectQueries_ were never cleared on
disconnect. If a query was sent but the response lost (e.g. server
disconnect mid-flight), the entry would remain in the pending set after
reconnect, causing queryCreatureInfo/queryGameObjectInfo to silently skip
re-issuing the query — leaving NPC and GO names unpopulated for those
entries.

Clear both sets on disconnect so reconnect sees them as unqueried and
re-sends the queries as needed. creatureInfoCache/gameObjectInfoCache_ are
intentionally preserved across sessions to avoid re-querying entries whose
responses did arrive.

src/game/game_handler.cpp

@@ -486,6 +486,10 @@ void GameHandler::disconnect() {
     contacts_.clear();
     transportAttachments_.clear();
     serverUpdatedTransportGuids_.clear();
+    // Clear in-flight query sets so reconnect can re-issue queries for any
+    // entries whose responses were lost during the disconnect.
+    pendingCreatureQueries.clear();
+    pendingGameObjectQueries_.clear();
     requiresWarden_ = false;
     wardenGateSeen_ = false;
     wardenGateElapsed_ = 0.0f;