Use same modeline in scripts/* as in other files

scripts/powerline

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
+# vim:fileencoding=utf-8:noet
 '''Powerline prompt and statusline script.'''
 import sys
 import os

scripts/powerline-lint

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
+# vim:fileencoding=utf-8:noet
 '''Powerline configuration checker.'''
 import argparse
 from powerline.lint import check