Fix typo

Author: elenatanasoiu

extensions/ql-vscode/test/vscode-tests/no-workspace/helpers.test.ts

@@ -635,7 +635,7 @@ describe("prepareCodeTour", () => {
 
     describe("if the workspace is already open", () => {
       it("should not open the tutorial workspace", async () => {
-        // Set isCodespaceTemplate to true to indicate the workspace has already been opened
+        // Set isCodespacesTemplate to true to indicate the workspace has already been opened
         jest.spyOn(Setting.prototype, "getValue").mockReturnValue(true);
 
         // set up directory to have a 'tutorial.code-workspace' file