The RadioSure plugin stores space-delimited URLs in the `url` field.

Playback or recording isn't possible without spacial handling, because all stream addresses are joined into a single quoted command line argument.

Early ST2 test versions (1.9.x) did not properly escape command line arguments, thus worked by accident.

And most later/core plugins omitted multi-URLs anyway, so it wasn't an issue until now.

However, support for space-delimited URL collections was meant to be a feature. (the JSON field `url` shouldn't become a list/array however.)

Multiple URLs in station row `url` prevent playback