Remove a bunch of useless 'use strict' definitions

src/components/structures/EmbeddedPage.js

@@ -16,8 +16,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-'use strict';
-
 import React from 'react';
 import PropTypes from 'prop-types';
 import request from 'browser-request';

src/components/views/auth/AuthBody.js

@@ -14,8 +14,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-'use strict';
-
 import React from 'react';
 
 export default class AuthBody extends React.PureComponent {

src/components/views/auth/AuthHeaderLogo.js

@@ -14,8 +14,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-'use strict';
-
 import React from 'react';
 
 export default class AuthHeaderLogo extends React.PureComponent {

src/components/views/auth/CompleteSecurityBody.js

@@ -14,8 +14,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-'use strict';
-
 import React from 'react';
 
 export default class CompleteSecurityBody extends React.PureComponent {

src/components/views/elements/Flair.js

@@ -14,8 +14,6 @@
  limitations under the License.
  */
 
-'use strict';
-
 import React from 'react';
 import PropTypes from 'prop-types';
 import FlairStore from '../../../stores/FlairStore';

src/components/views/messages/MAudioBody.js

@@ -14,8 +14,6 @@
  limitations under the License.
  */
 
-'use strict';
-
 import React from 'react';
 import MFileBody from './MFileBody';