[pitivi] build: Fix gst-devtools options

[Alexandru Băluț <alexbalut src gnome org>]

commit ceca4eb44e4db976bba94efb33a31ad28dc3a181
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Sat May 30 04:31:41 2020 +0200

    build: Fix gst-devtools options

 build/flatpak/org.pitivi.Pitivi.json | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/build/flatpak/org.pitivi.Pitivi.json b/build/flatpak/org.pitivi.Pitivi.json
index 233cf32c..520f6711 100644
--- a/build/flatpak/org.pitivi.Pitivi.json
+++ b/build/flatpak/org.pitivi.Pitivi.json
@@ -390,7 +390,6 @@
             "builddir": true,
             "config-opts": [
                 "-Ddoc=disabled",
-                "-Ddebug_viewer=false",
                 "--libdir=lib"
             ],
             "sources": [