[pitivi] bin: Force xdg-app to run in bash

[Thibault Saunier <tsaunier src gnome org>]

commit 9b786e66af04cb11481cf0d0a6a3c8d8523d08a3
Author: Thibault Saunier <tsaunier gnome org>
Date:   Mon Jan 25 16:35:33 2016 +0100

    bin: Force xdg-app to run in bash
    
    As it will fail miserably running on dash.
    It runs just fine in zsh, but I guess we do not care much here.

 build/xdg-app/pitivi-bundle |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/build/xdg-app/pitivi-bundle b/build/xdg-app/pitivi-bundle
index 4dbb1b1..c5ec99a 100755
--- a/build/xdg-app/pitivi-bundle
+++ b/build/xdg-app/pitivi-bundle
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # ------------------------------------------- #
 # Repository and bundle setup variables.