Update extensions/ql-vscode/src/log-insights/join-order.ts

Co-authored-by: Andrew Eisenberg <aeisenberg@github.com>

extensions/ql-vscode/src/log-insights/join-order.ts

@@ -26,12 +26,7 @@ function makeKey(
       'queryCausingWork was not defined on an event we expected it to be defined for!'
     );
   }
-  return (
-    queryCausingWork +
-    ':' +
-    predicate +
-    (suffix ? ' ' + suffix : '')
-  );
+  return `${queryCausingWork}:${predicate}${suffix ? ' ' + suffix : ''};
 }
 
 function getDependentPredicates(operations: string[]): I.List<string> {