mocp: no more sound after switching back from console

[Rolf Leggewie]

steps to reproduce in jammy (I use pipewire)

1) start mocp and play an audio file
2) switch to a console for example via Ctrl+Alt+F1
3) sounds stops playing which is expected behaviour
4) switch back to the GUI via Ctrl+Alt+F7
5) no sound, even though mocp continues to progress through the file

$ pactl info
Server String: /run/user/1000/pulse/native
Library Protocol Version: 35
Server Protocol Version: 35
Is Local: yes
Client Index: 1292
Tile Size: 65472
User Name: XXX
Host Name: XYZ
Server Name: PulseAudio (on PipeWire 0.3.48)
Server Version: 15.0.0
Default Sample Specification: float32le 2ch 48000Hz
Default Channel Map: front-left,front-right
Default Sink: alsa_output.pci-0000_00_1b.0.analog-stereo
Default Source: alsa_input.pci-0000_00_1b.0.analog-stereo
Cookie: bfcd:d3b5