Correct desktop launcher for pasystray-git

As we are using pasystray as a daemon to notify volume changes, we decided to patch the desktop launcher and add a script which will run pasystray with this options enabled.
Please note that the script was necessary because --notify=all flag in PipeWire gives a lot of notifications (even when pausing a video), and we only needed source and sink changes.
To do this we use the flag --notify={sink,source}, which seems to not work on a desktop launcher, but in a script. When using PulseAudio, the --notify=all flag would be enough.

srcpkgs/pasystray-git/files/pasystray-cereus

@@ -0,0 +1,2 @@
+ #!/bin/bash
+pasystray --notify={sink,source} &

srcpkgs/pasystray-git/patches/pipewire-launcher-cereus.patch

@@ -0,0 +1,13 @@
+diff --git a/data/pasystray.desktop b/data/pasystray.desktop
+index c48e124..61d3afb 100644
+--- a/data/pasystray.desktop
++++ b/data/pasystray.desktop
+@@ -3,7 +3,7 @@ Version=1.0
+ Name=PulseAudio System Tray
+ GenericName=
+ Comment=An Applet for PulseAudio
+-Exec=pasystray
++Exec=pasystray-cereus
+ Icon=pasystray
+ StartupNotify=true
+ Type=Application