fix(events): restore inline comma-separated speaker list

Commit 2e14900 (in PR #575) added `flow flow-xs` to the speaker list
<ul>, which forced vertical stacking via the flow utility's flex-
direction: column. This regressed the inline comma-separated layout
established in PR #570. The parent .event-detail__speakers wrapper
keeps its flow class to correctly space the heading from the list;
only the <ul> loses the flow classes.

Visible on /events/accessgiven-2026 among others.

Author: mattobee

src/pages/events/[slug].astro

@@ -320,7 +320,7 @@ const jsonLd = {
               <h2 class="text-large">
                 {allSpeakers.length === 1 ? 'Speaker' : 'Speakers'}
               </h2>
-              <ul role="list" class="event-detail__speaker-list flow flow-xs">
+              <ul role="list" class="event-detail__speaker-list">
                 {allSpeakers.map((speaker) => (
                   <li>
                     <span>{speaker.name}</span>