Update interfacelift.ini

InterfaceLift has slightly updated their page structure and style - I've updated the RegExp to reflect this so that the panel will work again.
Changes:
1) ' class="preview">.* ' -> 'class="preview".* '
Their "preview" <div> now has a style attribute after the class attribute, so I removed the end carat to allow the RegExp to match the tag and ignore anything in the <div> after ' class="preview" '.
2)  ' font-size: 18px" -> "font-size: 16px '
They've changed the font size for the <h1> to 16px.