scope.sh has bashisms and breaks if sh if posix

.config/ranger/scope.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 # ranger supports enhanced previews.  If the option "use_preview_script"
 # is set to True and this file exists, this script will be called and its
 # output is displayed in ranger.  ANSI color codes are supported.