Český Rozhlas: fix playButtonSelector in test case
Český Rozhlas: fix playButtonSelector in test case

It should match the selector provided in the connector.
carpet-berlin/web-scrobbler,david-sabata/web-scrobbler,carpet-berlin/web-scrobbler,inverse/web-scrobbler,david-sabata/web-scrobbler,alexesprit/web-scrobbler,fakelbst/Chrome-Last.fm-Scrobbler,galeksandrp/web-scrobbler,alexesprit/web-scrobbler,fakelbst/Chrome-Last.fm-Scrobbler,galeksandrp/web-scrobbler,inverse/web-scrobbler