Fixed syntax error on TLS section on Advanced -> Server

[LeonardoLarranaga]

There was a syntax error in the TLS Section:

Before:

// Enable TLS.
app.http.server.configuration.tlsConfiguration = .makeServerConfiguration(
    certificateChain: try NIOSSLCertificate.fromPEMFile("/path/to/cert.pem").map { .certificate($0) },
    privateKey: try NIOSSLPrivateKey(file: "/path/to/key.pem", format: .pem))
)

Error:

After:

app.http.server.configuration.tlsConfiguration = .makeServerConfiguration(
        certificateChain: try NIOSSLCertificate.fromPEMFile("/path/to/cert.pem").map { .certificate($0) },
        privateKey: .privateKey(try NIOSSLPrivateKey(file: "/path/to/key.pem", format: .pem))
    )

[0xTim]

Thanks!