Use the new scheme format in most places

The graphics subsystem still uses the old format as orbital manually
parses the fpath result.

net/virtio-netd/src/main.rs

@@ -95,7 +95,7 @@ fn deamon(daemon: redox_daemon::Daemon) -> Result<(), Box<dyn std::error::Error>
     let device = VirtioNet::new(mac_address, rx_queue, tx_queue);
     let mut scheme = NetworkScheme::new(device, format!("network.{name}"));
 
-    let mut event_queue = File::open("event:")?;
+    let mut event_queue = File::open("/scheme/event")?;
     event_queue.write(&syscall::Event {
         id: scheme.event_handle() as usize,
         flags: syscall::EVENT_READ,