Convert CommonJS exports to ES6-compatible exports

We use `export default` begrudgingly here. Ideally we'd use just `export`, though this entire SDK expects things to be exported as a default. Instead of breaking everything, we'll sacrifice our export pattern for a smaller diff - a later commit can always do the default export -> regular export conversion.

src/components/views/rooms/MemberInfo.js

@@ -50,7 +50,7 @@ import AutoHideScrollbar from "../../structures/AutoHideScrollbar";
 import MatrixClientPeg from "../../../MatrixClientPeg";
 import {EventTimeline} from "matrix-js-sdk";
 
-module.exports = createReactClass({
+export default createReactClass({
     displayName: 'MemberInfo',
 
     propTypes: {