message: controlled checkboxes use `checked` not `value`
diff: @@ -136,8 +136,8 @@ export default class ShareDialog extends React.Component {
  if (events.length > 0) {
  checkbox = <div>
  <input type="checkbox"
  - value={this.state.linkSpecificEvent}
  id="mx_ShareDialog_checkbox"
  + checked={this.state.linkSpecificEvent}
  onClick={this.onLinkSpecificEventCheckboxClick} />
  <label htmlFor="mx_ShareDialog_checkbox">
  { _t('Link to most recent message') }
  @@ -160,8 +160,8 @@ export default class ShareDialog extends React.Component {
  title = _t('Share Room Message');
  checkbox = <div>
  <input type="checkbox"
  - value={this.state.linkSpecificEvent}
  id="mx_ShareDialog_checkbox"
  + checked={this.state.linkSpecificEvent}
  onClick={this.onLinkSpecificEventCheckboxClick} />
  <label htmlFor="mx_ShareDialog_checkbox">
  { _t('Link to selected message') }
  