Add LB setting to new user settings

Put under labs out of concern for https://github.com/vector-im/riot-meta/issues/66

src/components/views/settings/tabs/user/LabsUserSettingsTab.js

@@ -53,6 +53,7 @@ export default class LabsUserSettingsTab extends React.Component {
                     {flags}
                     <SettingsFlag name={"enableWidgetScreenshots"} level={SettingLevel.ACCOUNT} />
                     <SettingsFlag name={"showHiddenEventsInTimeline"} level={SettingLevel.DEVICE} />
+                    <SettingsFlag name={"lowBandwidth"} level={SettingLevel.DEVICE} />
                 </div>
             </div>
         );