[gitg] flatpak: Fix libdazzle build

[Alberto Fanjul <albfan src gnome org>]

commit 7741ed3d4a0f01ce71460e4de4625e6f5970dfe8
Author: Alberto Fanjul <albertofanjul gmail com>
Date:   Wed Mar 13 23:08:42 2019 +0100

    flatpak: Fix libdazzle build

 org.gnome.gitgDevel.json | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/org.gnome.gitgDevel.json b/org.gnome.gitgDevel.json
index d3e5c73d..45f16c51 100644
--- a/org.gnome.gitgDevel.json
+++ b/org.gnome.gitgDevel.json
@@ -145,9 +145,9 @@
         },
         {
             "name" : "libdazzle",
-            "config-opt" : [
-                "--prefix=/opt/gnome",
-                "--libdir=/opt/gnome/lib"
+            "config-opts" : [
+                "--libdir=/app/lib",
+                "--buildtype=debugoptimized"
             ],
             "buildsystem" : "meson",
             "builddir" : true,