Fix pinned messages not re-linkifying on edit (#9042)

* Fix pinned messages not re-linkifying on edit

* Fix tests

src/events/EventTileFactory.tsx

@@ -48,8 +48,8 @@ import { shouldDisplayAsBeaconTile } from "../utils/beacon/timeline";
 export interface EventTileTypeProps {
     ref?: React.RefObject<any>; // `any` because it's effectively impossible to convince TS of a reasonable type
     mxEvent: MatrixEvent;
-    highlights: string[];
-    highlightLink: string;
+    highlights?: string[];
+    highlightLink?: string;
     showUrlPreview?: boolean;
     onHeightChanged: () => void;
     forExport?: boolean;