Fix trailing whitespace

Author: Andy Hanson

src/harness/fourslash.ts

@@ -2354,7 +2354,7 @@ ${code}
  let currentFileContent: string = undefined;
  let currentFileName = fileName;
  let currentFileOptions: { [s: string]: string } = {};
- 
+
  function resetLocalData() {
  currentFileContent = undefined;
  currentFileOptions = {};