[pitivi/1.0] flatpak: Pass GDK_ env vars when running a command in the sandbox

[Thibault Saunier <tsaunier src gnome org>]

commit b9769ab704f6e6beefb059d6b5e816c4131c3ec8
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Tue Jul 31 22:44:53 2018 +0200

    flatpak: Pass GDK_ env vars when running a command in the sandbox

 build/flatpak/pitivi-flatpak | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/build/flatpak/pitivi-flatpak b/build/flatpak/pitivi-flatpak
index 225bcf83..e1798a26 100755
--- a/build/flatpak/pitivi-flatpak
+++ b/build/flatpak/pitivi-flatpak
@@ -641,7 +641,7 @@ class PitiviFlatpak:  # pylint: disable=too-many-instance-attributes
         # The forwarded environment variables.
         forwarded = {}
         for envvar, value in os.environ.items():
-            if envvar.split("_")[0] in ("GST", "GTK", "PITIVI", "LC", "G") or \
+            if envvar.split("_")[0] in ("GDK", "GST", "GTK", "PITIVI", "LC", "G") or \
                     envvar in ["DISPLAY", "LANG"]:
                 forwarded[envvar] = value