Fix io.element.late_event received_ts vs received_at (#11789)

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/structures/grouper/LateEventGrouper.ts

@@ -25,7 +25,7 @@ interface UnsignedLateEventInfo {
     /**
      * Milliseconds since epoch representing the time the event was received by the server
      */
-    received_at: number;
+    received_ts: number;
     /**
      * An opaque identifier representing the group the server has put the late arriving event into
      */

src/components/views/rooms/EventTile.tsx

@@ -1127,7 +1127,7 @@ export class UnwrappedEventTile extends React.Component<EventTileProps, IState>
                 showRelative={this.context.timelineRenderingType === TimelineRenderingType.ThreadsList}
                 showTwelveHour={this.props.isTwelveHour}
                 ts={ts}
-                receivedTs={getLateEventInfo(this.props.mxEvent)?.received_at}
+                receivedTs={getLateEventInfo(this.props.mxEvent)?.received_ts}
             />
         );