gamelobby: update on unregister, clear on redraw

clear to erase names of no longer present players

gamelobby.go

@@ -77,6 +77,7 @@ func (gl *GameLobby) unregisterUnlocked(name string) {
 		copy(gl.playerOrder[i:], gl.playerOrder[i+1:])
 		gl.playerOrder = gl.playerOrder[:len(gl.playerOrder) - 1]
 	}
+	gl.Update()
 }
 
 func (gl *GameLobby) Resize(w, h int, glp *Player) {
@@ -136,6 +137,7 @@ func (p *GameLobbyPlayer) Redraw(gl *GameLobby) {
 	gl.Lock()
 	defer gl.Unlock()
 	v := p.lobbyv
+	v.Clear()
 	line := 0
 	fg := tg.ColorDefault
 	bg := tg.ColorDefault