better detect new connection in board/bot game stream - closes #7373
better detect new connection in board/bot game stream - closes #7373

before, on reconnect, the connect signal arrived before
the disconnect signal, resulting in a disconnected state.

now we don't send any disconnect signal if we know
that the game stream is closing because a new one opens.

luanlv/lila,luanlv/lila,luanlv/lila,arex1337/lila,arex1337/lila,luanlv/lila,arex1337/lila,arex1337/lila,luanlv/lila,arex1337/lila,arex1337/lila,arex1337/lila,luanlv/lila,luanlv/lila