mpris pause event

[remche]

First a big thanks for the work on stmps !

I noticed that the MPRIS "pause" event wont be emitted on play/pause. That would be great to allow widget update (I use waybar and custom/media module).

MPV dbus-monitor for information :

signal time=1732889263.782270 sender=:1.28686 -> destination=(null destination) serial=10 path=/org/mpris/MediaPlayer2; interface=org.freedesktop.DBus.Properties; member=PropertiesChanged
   string "org.mpris.MediaPlayer2.Player"
   array [
      dict entry(
         string "PlaybackStatus"
         variant             string "Playing"
      )
   ]
   array [
   ]