Use isCancelled() instead of manually checking phase

Author: andybalaam

src/rust-crypto/rust-crypto.ts

@@ -1040,11 +1040,7 @@ export class RustCrypto extends TypedEventEmitter<RustCryptoEvents, CryptoEventH
             new RustSdkCryptoJs.UserId(userId),
         );
         return requests
-            .filter(
-                (request) =>
-                    request.roomId === undefined &&
-                    request.phase() !== RustSdkCryptoJs.VerificationRequestPhase.Cancelled,
-            )
+            .filter((request) => request.roomId === undefined && !request.isCancelled())
             .map((request) => this.makeVerificationRequest(request));
     }