vpython: proper shebang :)

BUG=None
TEST=None
R=sergeyberezin@chromium.org

Change-Id: I2bb22ad002b82767c6a7efb68412f9c1dbf57c27
Reviewed-on: https://chromium-review.googlesource.com/502228Reviewed-by: Sergey Berezin <sergeyberezin@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>

vpython

-#/bin/bash
+#!/bin/bash
 
 # Copyright 2017 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be