[gnome-builder] flatpak: specify x-run-args

[Christian Hergert <chergert src gnome org>]

commit abce8a3d31501a4ab742718155751c5e4196550d
Author: Christian Hergert <chergert redhat com>
Date:   Sun Aug 6 16:38:51 2017 -0700

    flatpak: specify x-run-args
    
    This allows us to run Builder from within Builder using the Run button.

 org.gnome.Builder.json |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/org.gnome.Builder.json b/org.gnome.Builder.json
index a21648d..5ea9232 100644
--- a/org.gnome.Builder.json
+++ b/org.gnome.Builder.json
@@ -49,6 +49,7 @@
         "--filesystem=~/.local/share/flatpak",
         "--filesystem=/var/lib/flatpak"
     ],
+    "x-run-args" : [ "--standalone", "-vvvv" ],
     "build-options" : {
         "cflags": "-O2 -g",
         "cxxflags": "-O2 -g",