if av1 is not slow in test, av1 takes precedence over vp9 (#9938)

Signed-off-by: 21pages <sunboeasy@gmail.com>

src/flutter_ffi.rs

@@ -2332,6 +2332,7 @@ pub mod server_side {
             }
         }
         std::thread::spawn(move || start_server(true));
+        scrap::codec::test_av1();
     }
 
     #[no_mangle]