changed icon size

assets/sass/_theme/design-system/search.sass

@@ -21,7 +21,7 @@
     &:not(.pagefind-menu)    
         padding: half($spacing0) $spacing0
     &.toggle-icon::after
-        font-size: $h3-size
+        font-size: $h2-size
     &.toggle-both
         .menu & span
             padding-right: 0