Use bash instead of sh because of the '[[' command

The '[[' command is not guaranteed to be present in /bin/sh, and in fact
is missing in stock Ubuntu 8.04

tools/ddms/app/etc/ddms

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # Copyright 2005-2007, The Android Open Source Project
 #
 # Licensed under the Apache License, Version 2.0 (the "License");