Fix key attr placement in UserSettings

src/components/structures/UserSettings.js

@@ -364,8 +364,8 @@ module.exports = React.createClass({

        this._renderLabs = function () {
            let features = LABS_FEATURES.map(feature => (
                <div>
                    <input key={feature}
                <div key={feature}>
                    <input
                           type="checkbox"
                           id={feature}
                           name={feature}