fix(ui): Correct column labels (#87278)

Swapped by accident! 🧹

Author: leeandher

static/app/components/issues/groupListHeader.tsx

@@ -31,12 +31,12 @@ function GroupListHeader({
         <Fragment>
           <NarrowIssueWrapper hideDivider>{t('Issue')}</NarrowIssueWrapper>
           {withColumns.includes('firstSeen') && (
-            <FirstSeenWrapper breakpoint={COLUMN_BREAKPOINTS.LAST_SEEN} align="right">
+            <FirstSeenWrapper breakpoint={COLUMN_BREAKPOINTS.FIRST_SEEN} align="right">
               {t('First Seen')}
             </FirstSeenWrapper>
           )}
           {withColumns.includes('lastSeen') && (
-            <LastSeenWrapper breakpoint={COLUMN_BREAKPOINTS.FIRST_SEEN} align="right">
+            <LastSeenWrapper breakpoint={COLUMN_BREAKPOINTS.LAST_SEEN} align="right">
               {t('Age')}
             </LastSeenWrapper>
           )}