LibHTTP: Ensure finish_up() is not called more than once

There's no reason to manually call it on TLS close, the HTTP reading
logic is smart enough to handle connection closes transparently.
Fixes #8211.

Userland/Libraries/LibHTTP/HttpsJob.cpp

@@ -38,9 +38,6 @@ void HttpsJob::start()
             });
         }
     };
-    m_socket->on_tls_finished = [&] {
-        finish_up();
-    };
     m_socket->on_tls_certificate_request = [this](auto&) {
         if (on_certificate_requested)
             on_certificate_requested(*this);