am ac830fea: Fix dx launching script to use the new platform-tools location.

Merge commit 'ac830feace28957c9e84ce2cb0ed2a565bc24c99' into gingerbread-plus-aosp

* commit 'ac830feace28957c9e84ce2cb0ed2a565bc24c99':
  Fix dx launching script to use the new platform-tools location.