Fixed eslint error and copyright header

res/css/views/elements/_EventTilePreview.scss

@@ -1,5 +1,5 @@
 /*
-Copyright 2016 OpenMarket Ltd
+Copyright 2021 The Matrix.org Foundation C.I.C.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

src/components/views/elements/EventTilePreview.tsx

@@ -124,7 +124,11 @@ export default class EventTilePreview extends React.Component<IProps, IState> {
             "mx_GroupLayout": this.props.layout == Layout.Group,
         });
 
-        if (!this.props.userId) return <div className={classnames("mx_EventTilePreview_loader", className)}><Spinner /></div>;
+        if (!this.props.userId) {
+            return <div className={classnames("mx_EventTilePreview_loader", className)}>
+                <Spinner />
+            </div>;
+        }
 
         const event = this.fakeEvent(this.state);