Streaming: Updating song title in title bar of smplayer

[MusicWasMyFirstLove]

Hello!

* smplayer v19.5.0 r9214
* ubuntu 18.04 LTS up to date

the song title is only up to date when starting the stream. when it changes during streaming it dows not update. to update it i have to reststart the stream.

aside of that smplayer is a nice program!

Kind regards, christoph