Change fix the path of 'env' in some shebang lines.

data/ai/python/ai_launcher.py

@@ -1,4 +1,4 @@
-#!/bin/env python
+#!/usr/bin/env python
 # Copyright Greg Copeland, 2008
 # Released under GPL license for Wesnoth. See Wesnoth's
 # licensing terms for this module's specific license.

data/ai/python/wail/rwlocktest.py

@@ -1,4 +1,4 @@
-#!/bin/env python
+#!/usr/bin/env python
 #
 # Most of these tests were shamelessly taken and adopted from
 # Dmitry Dvoinikov's shared lock tests. As the lock implementations

data/tools/scoutDefault.py

@@ -1,4 +1,4 @@
-#!/bin/env python
+#!/usr/bin/env python
 #
 # Automagically set the village_per_scout parameters in MP scenarios.