Conform more of the codebase to strict typescript (#10841)

src/stores/CallStore.ts

@@ -146,7 +146,7 @@ export class CallStore extends AsyncStoreWithClient<{}> {
                 this.calls.set(room.roomId, call);
                 this.callListeners.set(
                     call,
-                    new Map<CallEvent, (...args: unknown[]) => unknown>([
+                    new Map<CallEvent, (...args: any[]) => unknown>([
                         [CallEvent.ConnectionState, onConnectionState],
                         [CallEvent.Destroy, onDestroy],
                     ]),

src/stores/RoomScrollStateStore.ts

@@ -42,8 +42,12 @@ export class RoomScrollStateStore {
         return this.scrollStateMap.get(roomId);
     }
 
-    public setScrollState(roomId: string, scrollState: ScrollState): void {
-        this.scrollStateMap.set(roomId, scrollState);
+    public setScrollState(roomId: string, scrollState: ScrollState | null): void {
+        if (scrollState === null) {
+            this.scrollStateMap.delete(roomId);
+        } else {
+            this.scrollStateMap.set(roomId, scrollState);
+        }
     }
 }