You can override the output with this function:
function custom_uplift_post_svg_icon() {
return '<i><svg version="1.1" class="sf-hover-svg" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
width="24px" height="24px" viewBox="0 0 24 24" enable-background="new 0 0 24 24" xml:space="preserve">
<path fill="none" stroke="#444444" stroke-width="2" stroke-miterlimit="10" d="M2,12h20 M15,19l7-7l-7-7"/>
</svg></i>';
}
add_filter('sf_port_post_svg_icon', 'custom_uplift_post_svg_icon');
add_filter('sf_post_standard_svg_icon', 'custom_uplift_post_svg_icon');
add_filter('sf_gallery_page_svg_icon', 'custom_uplift_post_svg_icon');
add_filter('sf_link_icon_svg', 'custom_uplift_post_svg_icon');
– Ed