Fix BenchmarkConnector call to console.warning (#588)

Opening any remote workload outside the harness threw a TypeError on the
first stray message instead of logging it.

Note that I didn't rebuild the existing remote workloads. I checked the
others and it looks like they show a bit diff in the bundle, so I chose
to leave them for now. The next rebuild will take this up.

Author: canova

resources/shared/benchmark.mjs

@@ -132,7 +132,7 @@ export class BenchmarkConnector {
     async onMessage(event) {
         const message = event.data;
         if (message.appId !== this.appId || message.key !== "benchmark-connector") {
-            console.warning("Invalid message", message);
+            console.warn("Invalid message", message);
             return;
         }