Pass ESLint validations: Tour Example

Problem/Motivation

At #3417482: [Meta] Pass Eslint validations we are aiming to have all the eslint validation checks passing for the Examples module.

On this issue, we'll be focused on the tour_example sub-module

Initial errors detected by 27/01/2024

/modules/tour_example/config/install/tour.tour.tour-example.yml
  41:77  error  Trailing spaces not allowed  no-trailing-spaces
  42:73  error  Trailing spaces not allowed  no-trailing-spaces
  43:75  error  Trailing spaces not allowed  no-trailing-spaces
  45:77  error  Trailing spaces not allowed  no-trailing-spaces
  46:79  error  Trailing spaces not allowed  no-trailing-spaces
  47:62  error  Trailing spaces not allowed  no-trailing-spaces
  50:77  error  Trailing spaces not allowed  no-trailing-spaces

Proposed resolution

1. Check the parent issue for detailed instructions about how to run eslint locally
2. Run eslint against the submodule: tour_example
3. Fix the issues found and make a MR with the fixes.