[pitivi] build: Pass GTK_DEBUG when running in the sandbox

[Alexandru Băluț <alexbalut src gnome org>]

commit 3a55c1f6862c6c5845cf4487b5eec2aa92fc61b2
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Tue Aug 30 16:40:27 2016 +0200

    build: Pass GTK_DEBUG when running in the sandbox
    
    Also sort the vars because it was getting messy.
    
    Differential Revision: https://phabricator.freedesktop.org/D1292

 build/flatpak/pitivi-flatpak |   17 ++++++++++++-----
 1 files changed, 12 insertions(+), 5 deletions(-)
---
diff --git a/build/flatpak/pitivi-flatpak b/build/flatpak/pitivi-flatpak
index 3f7cea3..03f6314 100755
--- a/build/flatpak/pitivi-flatpak
+++ b/build/flatpak/pitivi-flatpak
@@ -506,14 +506,21 @@ class PitiviFlatpak:  # pylint: disable=too-many-instance-attributes
                     "--env=CXX=ccache g++"]
 
         for envvar in [
-                "GST_CHECKS", "GST_DEBUG", "GST_VALIDATE", "GST_VALIDATE_LAUNCHER_DEBUG",
-                "PITIVI_DEBUG", "PITIVI_DEVELOPMENT", "DISPLAY", "GST_DEBUG_DUMP_DOT_DIR",
-                "LANG",
+                "DISPLAY",
+                "GST_CHECKS",
+                "GST_DEBUG",
+                "GST_DEBUG_DUMP_DOT_DIR",
+                ("GST_ENCODING_TARGET_PATH",
+                 "/app/share/gstreamer-1.0/presets/:/app/share/pitivi/gstpresets/"),
                 ("GST_PLUGIN_SYSTEM_PATH", "/app/lib/gstreamer-1.0/"),
                 ("GST_PRESET_PATH",
                  "/app/share/gstreamer-1.0/presets/:/app/share/pitivi/gstpresets/"),
-                ("GST_ENCODING_TARGET_PATH",
-                 "/app/share/gstreamer-1.0/presets/:/app/share/pitivi/gstpresets/")]:
+                "GST_VALIDATE",
+                "GST_VALIDATE_LAUNCHER_DEBUG",
+                "GTK_DEBUG",
+                "LANG",
+                "PITIVI_DEBUG",
+                "PITIVI_DEVELOPMENT"]:
             if not isinstance(envvar, str):
                 value = envvar[1] + ":" + os.environ.get(envvar[0], "")
                 envvar = envvar[0]