Final type fixes

Revert previous type import hack and type a couple more bits

src/room/usePTT.ts

@@ -16,11 +16,8 @@ limitations under the License.
 
 import { useCallback, useEffect, useState } from "react";
 import { MatrixClient } from "matrix-js-sdk/src/client";
-// XXX: This must come after the other js-sdk import because of
-// https://github.com/matrix-org/matrix-js-sdk/issues/2351
-import "matrix-js-sdk/src/@types/global";
 import { GroupCall } from "matrix-js-sdk/src/webrtc/groupCall";
-import { CallFeed } from "matrix-js-sdk/src/webrtc/callFeed";
+import { CallFeed, CallFeedEvent } from "matrix-js-sdk/src/webrtc/callFeed";
 
 export interface PTTState {
   pttButtonHeld: boolean;
@@ -74,7 +71,7 @@ export const usePTT = (
     }
 
     for (const callFeed of userMediaFeeds) {
-      callFeed.addListener("mute_state_changed", onMuteStateChanged);
+      callFeed.addListener(CallFeedEvent.MuteStateChanged, onMuteStateChanged);
     }
 
     const activeSpeakerFeed = userMediaFeeds.find((f) => !f.isAudioMuted());
@@ -86,7 +83,10 @@ export const usePTT = (
 
     return () => {
       for (const callFeed of userMediaFeeds) {
-        callFeed.removeListener("mute_state_changed", onMuteStateChanged);
+        callFeed.removeListener(
+          CallFeedEvent.MuteStateChanged,
+          onMuteStateChanged
+        );
       }
     };
   }, [userMediaFeeds]);