Give secret key field an `id` (#7489)

src/components/views/dialogs/security/AccessSecretStorageDialog.tsx

@@ -393,6 +393,7 @@ export default class AccessSecretStorageDialog extends React.PureComponent<IProp
                         <div className="mx_AccessSecretStorageDialog_recoveryKeyEntry_textInput">
                             <Field
                                 type="password"
+                                id="mx_securityKey"
                                 label={_t('Security Key')}
                                 value={this.state.recoveryKey}
                                 onChange={this.onRecoveryKeyChange}