Use the new scheme format in most places

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

graphics/bgad/src/main.rs

@@ -35,7 +35,7 @@ fn main() {
 
         let mut scheme = BgaScheme {
             bga,
-            display: File::open("input:producer").ok(),
+            display: File::open("/scheme/input/producer").ok(),
         };
 
         scheme.update_size();

graphics/fbcond/src/display.rs

@@ -56,7 +56,7 @@ impl Display {
         let input_handle = OpenOptions::new()
             .read(true)
             .custom_flags(O_NONBLOCK as i32)
-            .open(format!("input:consumer/{vt}"))?;
+            .open(format!("/scheme/input/consumer/{vt}"))?;
         let fd = input_handle.as_raw_fd();
 
         let written = libredox::call::fpath(fd as usize, &mut buffer)

graphics/fbcond/src/main.rs

@@ -41,7 +41,7 @@ fn inner(daemon: redox_daemon::Daemon, vt_ids: &[usize]) -> ! {
         .create(true)
         .truncate(true)
         .custom_flags(O_NONBLOCK as i32)
-        .open(":fbcon")
+        .open("/scheme/fbcon")
         .expect("fbcond: failed to create fbcon scheme");
     event_queue
         .subscribe(