fix(notifications) Change moderation notifications to medium (#11262)

react/features/av-moderation/middleware.js

             sticky: true,
             titleKey,
             uid
-        }, NOTIFICATION_TIMEOUT_TYPE.STICKY));
+        }, NOTIFICATION_TIMEOUT_TYPE.MEDIUM));
 
         break;
     }
                         sticky: true,
                         customActionNameKey: [ 'notify.unmute' ],
                         customActionHandler: [ () => dispatch(muteLocal(false, MEDIA_TYPE.AUDIO)) ]
-                    }, NOTIFICATION_TIMEOUT_TYPE.STICKY));
+                    }, NOTIFICATION_TIMEOUT_TYPE.MEDIUM));
                     dispatch(playSound(ASKED_TO_UNMUTE_SOUND_ID));
                 }
             });

react/features/base/participants/actions.js

             titleArguments: {
                 participantDisplayName: getParticipantDisplayName(getState, participant.getId())
             }
-        }, NOTIFICATION_TIMEOUT_TYPE.LONG));
+        }, NOTIFICATION_TIMEOUT_TYPE.MEDIUM));
     };
 }