refactor: simplify async function calls in asyncCall and Vm class

src/vm/vm.class.ts

@@ -35,9 +35,7 @@ export class Vm {
       this.jail.setSync(
         plugin.getName(),
         new ivm.Reference(async (...args) => {
-          const res = await plugin.run(...args);
-
-          return res;
+          return await plugin.run(...args);
         })
       );
     }