Typo (wrong method) in trailing metadata log

Signed-off-by: erikness-doordash <[email protected]>

Author: erikness-doordash

src/dispatcher.rs

@@ -496,7 +496,7 @@ impl Dispatcher {
             Some(id) => *id,
             None => {
                 // TODO: change back to a panic once underlying issue is fixed.
-                trace!("on_grpc_receive_initial_metadata: invalid token_id");
+                trace!("on_grpc_receive_trailing_metadata: invalid token_id");
                 return;
             }
         };