[pitivi] build: Do not finish build if *not* bundling

[Thibault Saunier <tsaunier src gnome org>]

commit a2e9c056d2705206ed1249f02a9523daaecd4cb6
Author: Thibault Saunier <tsaunier gnome org>
Date:   Mon Sep 5 15:35:39 2016 -0300

    build: Do not finish build if *not* bundling

 build/flatpak/pitivi-flatpak |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/build/flatpak/pitivi-flatpak b/build/flatpak/pitivi-flatpak
index 63d0b52..48d9a6e 100755
--- a/build/flatpak/pitivi-flatpak
+++ b/build/flatpak/pitivi-flatpak
@@ -480,7 +480,7 @@ class PitiviFlatpak:  # pylint: disable=too-many-instance-attributes
 
             builder_args = ["flatpak-builder",
                             "--ccache", self.prefix, self.json]
-            if self.bundle:
+            if not self.bundle:
                 builder_args.append("--build-only")
 
             message("Building Pitivi %s", self.branch)