Increased updateInterval booster time

from botAmounts * 0.13 to 0.15

src/RandomPlayerbotMgr.cpp

@@ -323,7 +323,7 @@ void RandomPlayerbotMgr::UpdateAIInternal(uint32 elapsed, bool /*minimal*/)
     // which prevents unneeded expensive GameTime calls.
     if (_isBotInitializing)
     {
-        _isBotInitializing = GameTime::GetUptime().count() < sPlayerbotAIConfig->maxRandomBots * 0.13;
+        _isBotInitializing = GameTime::GetUptime().count() < sPlayerbotAIConfig->maxRandomBots * 0.15;
     }
 
     uint32 updateIntervalTurboBoost = _isBotInitializing ? 1 : sPlayerbotAIConfig->randomBotUpdateInterval;