[pitivi] flatpak: Fix running testsuite

[Thibault Saunier <tsaunier src gnome org>]

commit 8eebb6dd7ef133b58298d549a93238c49967fd3a
Author: Thibault Saunier <tsaunier gnome org>
Date:   Tue Jul 18 11:44:28 2017 -0400

    flatpak: Fix running testsuite

 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 7a4a0da..2431280 100755
--- a/build/flatpak/pitivi-flatpak
+++ b/build/flatpak/pitivi-flatpak
@@ -452,7 +452,7 @@ class PitiviFlatpak:  # pylint: disable=too-many-instance-attributes
 
         if self.check:
             self.run_in_sandbox("gst-validate-launcher",
-                                os.path.join(self.topdir, "tests/run_testsuite.py"),
+                                os.path.join(self.topdir, "tests/ptv_testsuite.py"),
                                 "--xunit-file", "xunit.xml", exit_on_failure=True,
                                 cwd=self.topdir)