LibWeb: Unblock port 9000

This was blocked because it can be used for cross-protocol attacks on
some network printers. However, it's also used by the web platform
tests. One can argue that getting WPT working is more important than
theoretical attacks on poorly configured printers.

Userland/Libraries/LibWeb/Loader/ResourceLoader.cpp

@@ -449,7 +449,7 @@ bool ResourceLoader::is_port_blocked(int port)
         43, 53, 77, 79, 87, 95, 101, 102, 103, 104, 109, 110, 111, 113,
         115, 117, 119, 123, 135, 139, 143, 179, 389, 465, 512, 513, 514,
         515, 526, 530, 531, 532, 540, 556, 563, 587, 601, 636, 993, 995,
-        2049, 3659, 4045, 6000, 6379, 6665, 6666, 6667, 6668, 6669, 9000 };
+        2049, 3659, 4045, 6000, 6379, 6665, 6666, 6667, 6668, 6669 };
     for (auto blocked_port : ports)
         if (port == blocked_port)
             return true;