use 2 spaces for indentation in sanitize.js
See r2469 and https://groups.google.com/d/topic/svg-edit/fKGQEZ6h7-g/ git-svn-id: http://svg-edit.googlecode.com/svn/trunk@2471 eee81c28-f429-11dd-99c0-75d572ba1dddmaster
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