build-aux: Remove StatusNotifierItem Flatpak permission

Since Qt 6.2, "org.kde.StatusNotifierItem-2-2" is no longer needed to
make the tray feature work

(cherry picked from commit e14b0e99bbe6102ffc04bb2bb1773437822458be)

build-aux/com.obsproject.Studio.json

@@ -17,7 +17,6 @@
         "--talk-name=org.freedesktop.Flatpak",
         "--talk-name=org.freedesktop.Notifications",
         "--talk-name=org.a11y.Bus",
-        "--own-name=org.kde.StatusNotifierItem-2-2",
         "--system-talk-name=org.freedesktop.Avahi",
         "--env=VST_PATH=/app/extensions/Plugins/vst"
     ],