[gnome-builder] flatpak: fix build type for nightly

[Christian Hergert <chergert src gnome org>]

commit 2b4dfae6254d881b641304e6d12345bd88fa295e
Author: Christian Hergert <chergert redhat com>
Date:   Fri Feb 22 22:47:13 2019 -0800

    flatpak: fix build type for nightly

 build-aux/flatpak/org.gnome.Builder.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/build-aux/flatpak/org.gnome.Builder.json b/build-aux/flatpak/org.gnome.Builder.json
index eeeaa10c0..c80a4edcc 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -549,7 +549,7 @@
             "builddir" : true,
             "config-opts" : [
                 "--libdir=lib",
-                "--buildtype=release",
+                "--buildtype=debugoptimized",
                 "-Dctags_path=/app/bin/ctags",
                 "-Dfusermount_wrapper=true",
                 "-Dwith_tcmalloc=true",