Fix EventTilePreview display names

Because of 91df392a2a, we now need to
additionally set rawDisplayName to properly fake our display name for an
event.

Signed-off-by: Robin Townsend <robin@robin.town>

src/components/views/elements/EventTilePreview.tsx

@@ -102,6 +102,7 @@ export default class EventTilePreview extends React.Component<IProps, IState> {
         // Fake it more
         event.sender = {
             name: this.props.displayName || this.props.userId,
+            rawDisplayName: this.props.displayName,
             userId: this.props.userId,
             getAvatarUrl: (..._) => {
                 return Avatar.avatarUrlForUser(