Fix aria-hidden attribute by adding explicit "true" to its value

GitOrigin-RevId: 173f2e2d18a993ee81506d420b120231e4f40574

services/web/app/views/_mixins/eyebrow.pug

@@ -1,5 +1,5 @@
 mixin eyebrow(text)
     span.mono-text
-        span(aria-hidden) {
+        span(aria-hidden="true") {
         span #{text}
-        span(aria-hidden) }
+        span(aria-hidden="true") }