Add permission for Flatpak. (#291)

* Add permission for Flatpak.

Adding --talk-name=org.freedesktop.Flatpak as this is needed to launch applications on the host. Example flatpak-spawn --host sleep 1m.

* Alphabetical order

packaging/linux/flatpak/dev.lizardbyte.sunshine.yml

@@ -5,15 +5,16 @@ sdk: org.freedesktop.Sdk
 command: sunshine
 separate-locales: false
 finish-args:
-  - --share=ipc
-  - --socket=x11
-  - --socket=wayland
-  - --socket=pulseaudio
-  - --share=network
   - --device=all
-  - --persist=.config/sunshine
-  - --system-talk-name=org.freedesktop.Avahi
   - --env=PULSE_PROP_media.category=Manager
+  - --persist=.config/sunshine
+  - --share=ipc
+  - --share=network
+  - --socket=pulseaudio
+  - --socket=wayland
+  - --socket=x11
+  - --system-talk-name=org.freedesktop.Avahi
+  - --talk-name=org.freedesktop.Flatpak
 
 cleanup:
   - /include