Fix theoretical bug where VerificationRequestDialog uses an outdated request (#30870)

* Tests for VerificationRequestDialog

* Fix theoretical bug where VerificationRequestDialog uses an outdated request

We were passing on `this.props.verificationRequest` to `EncryptionPanel` but we
should be passing on the request in `this.state`. This would not cause a problem
in practice because the `EncryptionPanel` immediately overwrites the request if
you supply a `verificationRequestPromise`.

src/components/views/dialogs/VerificationRequestDialog.tsx

@@ -60,7 +60,7 @@ export default class VerificationRequestDialog extends React.Component<IProps, I
             >
                 <EncryptionPanel
                     layout="dialog"
-                    verificationRequest={this.props.verificationRequest}
+                    verificationRequest={this.state.verificationRequest}
                     verificationRequestPromise={this.props.verificationRequestPromise}
                     onClose={this.props.onFinished}
                     member={member}