[sushi] flatpak: add pulseaudio permissions

[Cosimo Cecchi <cosimoc src gnome org>]

commit 1ab86315f480e07bb5eb6f623aa10de0fc02207d
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Sat Jun 15 07:46:28 2019 -0700

    flatpak: add pulseaudio permissions
    
    We'll need to play audio.

 flatpak/org.gnome.NautilusPreviewer.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/flatpak/org.gnome.NautilusPreviewer.json b/flatpak/org.gnome.NautilusPreviewer.json
index 05ff8af..696c8e4 100644
--- a/flatpak/org.gnome.NautilusPreviewer.json
+++ b/flatpak/org.gnome.NautilusPreviewer.json
@@ -17,6 +17,7 @@
         "*.a"
     ],
     "finish-args": [
+        "--socket=pulseaudio",
         "--socket=x11",
         "--socket=wayland",
         "--share=ipc",