fix: show intermission after demo playback

thx jamz :)
Two fixes of wrong messages about change to active/spectate mode.
First fix causes, that when player1: plays non-team mode + already is in active mode + changes team to enemy, then will appear message: "you can't switch teams while being alive".
Current wrong message is: "you can't change to active mode".

Second fix disables redundant info: "$playername changed to active play", after change to enemy team in non-team modes, when he is already in active mode.