fix: filter-sort-direction icon

Author: Frank Pagan

src/css/core.css

@@ -64,19 +64,19 @@ textarea {
    toggle order icons transform filter.js
 =================================*/
 
-a[filter-sort-toggle]:before {
+a[icon][filter-sort-direction]:before {
     font-family: 'Font Awesome 5 Free';
     content: "\f0dc";
     font-weight: 900;
 }
 
-a[filter-sort-toggle=asc]:before {
+a[icon][filter-sort-direction=asc]:before {
     font-family: 'Font Awesome 5 Free';
     content: "\f0de";
     font-weight: 900;
 }
 
-a[filter-sort-toggle=desc]:before {
+a[icon][filter-sort-direction=desc]:before {
     font-family: 'Font Awesome 5 Free';
     content: "\f0dd";
     font-weight: 900;