fix warning about data attribute casing

web/src/components/events/DateList.tsx

@@ -62,7 +62,7 @@ export const DateList = ({ event }: { event: EventFragment }) => {
         <span>Tid</span>
         <span>Sted</span>
       </div>
-      <ul className={styles.dateList} data-showAll={showAllDates}>
+      <ul className={styles.dateList} data-showall={showAllDates}>
         {futureOccurrences.map((occurrence) => (
           <DateListItem
             key={occurrence.id}