Fixed #7906 -- Modified admin_scripts regression test to use the same python...

Fixed #7906 -- Modified admin_scripts regression test to use the same python executable that is running the test suite, rather than using 'python' on the path. Thanks to Chris Hasenpflug for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8056 bcc190cf-cafb-0310-a4f2-bffc1f526a37