adapt typespec-autorest-canonical to context changes

Author: markcowl

packages/typespec-autorest-canonical/src/emitter.ts

@@ -95,6 +95,7 @@ async function emitAllServices(
       service,
       version: canonicalVersion,
       tcgcSdkContext,
+      multiService: services.length > 1,
     };
     const results = await getOpenAPIForService(context, options);
     const result = results[0];