Better handle connection errors in tile38-cli

This commit fixes an issue with the tile38-cli where it will
continually print "Could not connect to Tile38..." when it was
unable to connect to the tile38-server.

It now cleanly prints the message only once.

cmd/tile38-cli/main.go

@@ -277,13 +277,6 @@ func main() {
 		}
 	}()
 	for {
-		if conn == nil {
-			connDial()
-			if conn == nil {
-				continue
-			}
-		}
-
 		var command string
 		var err error
 		if oneCommand == "" {