BattleScreen::createBattleEndHUD takes a null result message and builds
the end screen from the local battle, then BattleScreen::sendGoHomeMessage
fires - so in this mode the client decides the battle is over and asks to
go home on its own. we now clear the stopped flag on that request instead
of leaving the session wedged until the next login.
battle turns are logged with their tick, checksum and command types while
the flag is up, so the traffic at the end of a battle is visible.
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