matrix: fix instant crash with e2ee

also some more attempts at fixing it, so far all i've found is that if
we don't delete the cryptoStore, the matrix client also gets the same
error we do if it send s a message to us (no session with given ID
found).

matrix.go

@@ -140,7 +140,6 @@ func (d *MatrixDaemon) handleMessage(source mautrix.EventSource, evt *event.Even
 	if evt.Sender == d.userID {
 		return
 	}
-	fmt.Printf("RECV %+v\n", evt.Content)
 	lang := "en-us"
 	if l, ok := d.languages[evt.RoomID]; ok {
 		if _, ok := d.app.storage.lang.Telegram[l]; ok {