message: Fix share message context menu option keyboard a11y
diff: @@ -414,7 +414,7 @@ export default createReactClass({
  }
  // XXX: if we use room ID, we should also include a server where the event can be found (other than in the domain of the event ID)
  const permalinkButton = (
  - <MenuItem className="mx_MessageContextMenu_field">
  + <MenuItem className="mx_MessageContextMenu_field" onClick={this.onPermalinkClick}>
  <a href={permalink} target="_blank" rel="noopener" onClick={this.onPermalinkClick} tabIndex={-1}>
  { mxEvent.isRedacted() || mxEvent.getType() !== 'm.room.message'
  ? _t('Share Permalink') : _t('Share Message') }
  