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

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

libs/hbb_common/src/config.rs

@@ -2238,6 +2238,7 @@ pub mod keys {
     pub const OPTION_ENABLE_ANDROID_SOFTWARE_ENCODING_HALF_SCALE: &str =
         "enable-android-software-encoding-half-scale";
     pub const OPTION_ENABLE_TRUSTED_DEVICES: &str = "enable-trusted-devices";
+    pub const OPTION_AV1_TEST: &str = "av1-test";
 
     // buildin options
     pub const OPTION_DISPLAY_NAME: &str = "display-name";