[gnome-builder] flatpak: use _ for meson option names

[Christian Hergert <chergert src gnome org>]

commit b91c3bb2e89b4edcd297c6d0ca5310d46db058f1
Author: Christian Hergert <chergert redhat com>
Date:   Sun Jun 18 13:58:31 2017 -0700

    flatpak: use _ for meson option names

 org.gnome.Builder.json |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/org.gnome.Builder.json b/org.gnome.Builder.json
index 876778c..eec3122 100644
--- a/org.gnome.Builder.json
+++ b/org.gnome.Builder.json
@@ -621,7 +621,7 @@
             "name": "gnome-builder",
             "buildsystem": "meson",
             "builddir": true,
-            "config-opts": [ "--libdir=/app/lib", "-Denable-tracing=true", "-Denable-debug=true", 
"-Dwith-channel=flatpak-nightly" ],
+            "config-opts": [ "--libdir=/app/lib", "-Denable_tracing=true", "-Denable_debug=true", 
"-Dwith_channel=flatpak-nightly" ],
             "sources": [
                 {
                     "type": "git",