[gimp] build: add Wayland support to nightly flatpak.

[Jehan <jehanp src gnome org>]

commit 11e8ba0f514fba19ac1b44ff3ce7129ac4fa5baa
Author: Jehan <jehan girinstud io>
Date:   Sun Apr 28 02:51:55 2019 +0900

    build: add Wayland support to nightly flatpak.
    
    This was removed for the stable flatpak as it's GTK+2 which has no
    support anyway but should be present for the future GIMP 3 flatpak.

 build/flatpak/org.gimp.GIMP-nightly.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/build/flatpak/org.gimp.GIMP-nightly.json b/build/flatpak/org.gimp.GIMP-nightly.json
index 9f3438dd12..311696a415 100644
--- a/build/flatpak/org.gimp.GIMP-nightly.json
+++ b/build/flatpak/org.gimp.GIMP-nightly.json
@@ -9,7 +9,7 @@
     "rename-desktop-file": "gimp.desktop",
     "rename-icon": "gimp",
     "finish-args": ["--share=ipc", "--share=network",
-                    "--socket=x11",
+                    "--socket=x11", "--socket=wayland",
                     "--filesystem=host", "--filesystem=xdg-config/GIMP",
                     "--filesystem=xdg-config/gtk-3.0", "--filesystem=/tmp",
                     "--talk-name=org.gtk.vfs", "--talk-name=org.gtk.vfs.*",