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';
 

src/notifications/VectorPushRulesDefinitions.js

@@ -15,8 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-'use strict';
-
 import { _td } from '../languageHandler';
 import {StandardActions} from "./StandardActions";
 import {PushRuleVectorState} from "./PushRuleVectorState";

src/notifications/index.js

@@ -15,8 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-'use strict';
-
 export * from "./NotificationUtils";
 export * from "./PushRuleVectorState";
 export * from "./VectorPushRulesDefinitions";

src/utils/MegolmExportEncryption.js

@@ -15,8 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-"use strict";
-
 // polyfill textencoder if necessary
 import * as TextEncodingUtf8 from 'text-encoding-utf-8';
 let TextEncoder = window.TextEncoder;

test/test-utils.js

@@ -1,5 +1,3 @@
-"use strict";
-
 import React from 'react';
 import {MatrixClientPeg as peg} from '../src/MatrixClientPeg';
 import dis from '../src/dispatcher/dispatcher';

test/utils/MegolmExportEncryption-test.js

@@ -14,8 +14,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-"use strict";
-
 import {TextEncoder} from "util";
 import nodeCrypto from "crypto";
 import { Crypto } from "@peculiar/webcrypto";