Allow Xfce for Solus Update Service

[etokarew]

Please confirm there isn't an existing open bug report

• [X] I have searched open bugs for this issue

Summary

Allow Xfce Desktop Environment in /usr/share/xdg/autostart/solus-update.desktop:

OnlyShowIn=Budgie;GNOME;KDE;MATE;XFCE;

Steps to reproduce

cat /usr/share/xdg/autostart/solus-update.desktop | grep -i onlyShowIn

Expected result

Solus Update Service autorun with Xfce4 session

Actual result

Solus Update Service does not start with Xfce4 session

Environment

• [X] Is system up to date?

Repo

Shannon (stable)

Desktop Environment

Xfce

System details

System:
  Host: p9x79 Kernel: 6.9.12-297.current arch: x86_64 bits: 64
  Desktop: Xfce v: 4.18.1 Distro: Solus 4.5 resilience
Machine:
  Type: Desktop Mobo: ASUSTeK model: P9X79 v: Rev 1.xx
    serial: <superuser required> BIOS: American Megatrends v: 4701
    date: 05/06/2014
CPU:
  Info: 8-core Intel Xeon E5-2670 0 [MT MCP] speed (MHz): avg: 1207
    min/max: 1200/3300
Graphics:
  Device-1: AMD Baffin [Radeon RX 460/560D / Pro
    450/455/460/555/555X/560/560X] driver: amdgpu v: kernel
  Device-2: Microsoft LifeCam Cinema driver: snd-usb-audio,uvcvideo
    type: USB
  Display: x11 server: X.Org v: 21.1.13 with: Xwayland v: 24.1.1 driver: X:
    loaded: amdgpu unloaded: fbdev,modesetting,vesa dri: radeonsi gpu: amdgpu
    resolution: 1: 1080x1920~60Hz 2: 1920x1080~60Hz
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 24.1.5 renderer: AMD
    Radeon RX 460 Graphics (radeonsi polaris11 LLVM 18.1.8 DRM 3.57
    6.9.12-297.current)
Network:
  Device-1: Intel 82579V Gigabit Network driver: e1000e
Drives:
  Local Storage: total: 3.08 TiB used: 606.13 GiB (19.2%)
Info:
  Memory: total: 32 GiB available: 31.29 GiB used: 5.79 GiB (18.5%)
  Processes: 397 Uptime: 2d 18h 55m Shell: Bash inxi: 3.3.35

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