[pitivi] Fix launching pitivi in flatpak env from without the source dir

[Thibault Saunier <tsaunier src gnome org>]

commit 79d2b3cd4194916499cced6102ed1fe6f80ef092
Author: Thibault Saunier <tsaunier gnome org>
Date:   Mon Jun 6 20:51:25 2016 -0400

    Fix launching pitivi in flatpak env from without the source dir

 bin/pitivi-env |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/bin/pitivi-env b/bin/pitivi-env
index 9c7461d..04bd6f5 100755
--- a/bin/pitivi-env
+++ b/bin/pitivi-env
@@ -35,7 +35,7 @@ then
         alias $i="$FLATPAK_ENVPATH/pitivi/build/flatpak/pitivi-flatpak -b $i"
     done
 
-    alias pitivi="$FLATPAK_ENVPATH/pitivi/build/flatpak/pitivi-flatpak -b bin/pitivi"
+    alias pitivi="$FLATPAK_ENVPATH/pitivi/build/flatpak/pitivi-flatpak -b $FLATPAK_ENVPATH/pitivi/bin/pitivi"
 
     export PS1="(ptv-flatpak) $PS1"
     export PATH="$FLATPAK_ENVPATH/bin/:$PATH"