fix(context-menus) Don't show volume slider on iOS web

react/features/participants-pane/components/web/MeetingParticipantContextMenu.js

 import { Avatar } from '../../../base/avatar';
 import { isToolbarButtonEnabled } from '../../../base/config/functions.web';
 import { openDialog } from '../../../base/dialog';
+import { isIosMobileBrowser } from '../../../base/environment/utils';
 import { translate } from '../../../base/i18n';
 import {
     IconCloseCircle,
             return null;
         }
 
+        const showVolumeSlider = !isIosMobileBrowser()
+              && overflowDrawer
+              && typeof _volume === 'number'
+              && !isNaN(_volume);
+
         const actions
             = _participant?.isFakeParticipant ? (
                 <>
                             )
                         }
                     </ContextMenuItemGroup>
-                    { overflowDrawer && typeof _volume === 'number' && !isNaN(_volume)
+                    { showVolumeSlider
                         && <ContextMenuItemGroup>
                             <VolumeSlider
                                 initialValue = { _volume }

react/features/video-menu/components/web/RemoteVideoMenuTriggerButton.js

 
 import ConnectionIndicatorContent from
     '../../../../features/connection-indicator/components/web/ConnectionIndicatorContent';
-import { isMobileBrowser } from '../../../base/environment/utils';
+import { isIosMobileBrowser, isMobileBrowser } from '../../../base/environment/utils';
 import { translate } from '../../../base/i18n';
 import { Icon, IconMenuThumb } from '../../../base/icons';
 import { getLocalParticipant, getParticipantById, PARTICIPANT_ROLE } from '../../../base/participants';
         } = this.props;
 
         const buttons = [];
+        const showVolumeSlider = !isIosMobileBrowser()
+              && onVolumeChange
+              && typeof initialVolumeValue === 'number'
+              && !isNaN(initialVolumeValue);
 
         if (_isModerator) {
             if (!_disableRemoteMute) {
             );
         }
 
-        if (onVolumeChange && typeof initialVolumeValue === 'number' && !isNaN(initialVolumeValue)) {
+        if (showVolumeSlider) {
             buttons.push(
                 <VolumeSlider
                     initialValue = { initialVolumeValue }