[epiphany] flatpak: grant access to CUPS socket

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 9f163ade271e9ffb98aa6010c22acaedf584e0ad
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon May 11 15:30:16 2020 -0500

    flatpak: grant access to CUPS socket
    
    Apparently this is a thing we can do, until I have time to make it use
    the printing portal.

 org.gnome.Epiphany.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/org.gnome.Epiphany.json b/org.gnome.Epiphany.json
index ae447b8a1..8c4bcb56f 100644
--- a/org.gnome.Epiphany.json
+++ b/org.gnome.Epiphany.json
@@ -14,6 +14,7 @@
         "--filesystem=xdg-download",
         "--share=ipc",
         "--share=network",
+        "--socket=cups",
         "--socket=fallback-x11",
         "--socket=pulseaudio",
         "--socket=wayland",