Ensure the logFileLocation is set

`logFileLocation` was not set after a query finishes running. I don't
know when this bug was introduced. I think it goes as far back as
the refactor to remove the old query server.

extensions/ql-vscode/src/query-results.ts

@@ -74,7 +74,10 @@ export class CompletedQueryInfo implements QueryWithResults {
      * Map from result set name to SortedResultSetInfo.
      */
     public sortedResultsInfo: Record<string, SortedResultSetInfo> = {},
-  ) {}
+  ) {
+    // The log path is only set when loading from the query history.
+    this.logFileLocation = logFileLocation ?? this.query.logPath;
+  }
 
   setResultCount(value: number) {
     this.resultCount = value;