[gimp] build: add "org.freedesktop.FileManager1" bus access to flatpak.

[Jehan <jehanp src gnome org>]

commit 5c20d220dd84a1755bb44223bf96b03990ac3412
Author: Jehan <jehan girinstud io>
Date:   Tue Jan 8 23:23:50 2019 +0100

    build: add "org.freedesktop.FileManager1" bus access to flatpak.
    
    Syncing the nightly flatpak with the stable one.
    See issue #1588.

 build/flatpak/org.gimp.GIMP-nightly.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/build/flatpak/org.gimp.GIMP-nightly.json b/build/flatpak/org.gimp.GIMP-nightly.json
index 65d3c2a339..c790ef1b74 100644
--- a/build/flatpak/org.gimp.GIMP-nightly.json
+++ b/build/flatpak/org.gimp.GIMP-nightly.json
@@ -12,7 +12,8 @@
                     "--socket=x11",
                     "--filesystem=host", "--filesystem=xdg-config/GIMP",
                     "--filesystem=xdg-config/gtk-3.0", "--filesystem=/tmp",
-                    "--talk-name=org.gtk.vfs", "--talk-name=org.gtk.vfs.*" ],
+                    "--talk-name=org.gtk.vfs", "--talk-name=org.gtk.vfs.*",
+                    "--talk-name=org.freedesktop.FileManager1"],
     "tags": ["GTK+3", "nightly"],
     "desktop-file-name-prefix": "(Nightly) ",
     "build-options" : {