Make the maximised prop of VideoTile optional

src/video-grid/VideoGrid.stories.tsx

@@ -77,7 +77,6 @@ export const ParticipantsTest = () => {
               key={item.id}
               name={`User ${item.id}`}
               disableSpeakingIndicator={items.length < 3}
-              maximised={false}
               {...rest}
             />
           )}

src/video-grid/VideoTile.tsx

@@ -33,7 +33,7 @@ interface Props {
   mediaRef?: React.RefObject<MediaElement>;
   onOptionsPress?: () => void;
   localVolume?: number;
-  maximised: boolean;
+  maximised?: boolean;
   fullscreen?: boolean;
   onFullscreen?: () => void;
   className?: string;