iotests: Drop Python version from 065's Shebang

Test 065 specified python2 to be used in its Shebang; this might not
work on systems without a python2 symlink and furthermore it is now
counter-productive, as the check script compares the Shebang to
"#!/usr/bin/env python" and only uses the Python interpreter selected by
configure on an exact match.
Signed-off-by: NMax Reitz <mreitz@redhat.com>
Reviewed-by: NFam Zheng <famz@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/065

-#!/usr/bin/env python2
+#!/usr/bin/env python
 #
 # Test for additional information emitted by qemu-img info on qcow2
 # images