Remove type-attribute

W3C complains about:
Warning: The type attribute for the style element is not needed and should be omitted.

for the code:
<style type=”text/css” id=”aoatfcss” media=”all”>

that is generated by the plugin, at
autoptimize/classes/autoptimizeStyles.php:858:

Sugestion:
Either always skip the type-attribute, or add an option so the user can chose if they want type-attributes or not.

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