Fix type error in Redux Essentials.

[samwightt]

---

name: "Fix error in Redux Essentials tutorial"
about: Fixes a type error in the Redux Essentials tutorial

PR Type: Documentation Fix

Does this PR add a new feature, or fix a bug?

This PR fixes a bug in the Redux Essentials Tutorial, fixing issue #3812.

Why should this PR be included?

New users who go through the Redux Essentials tutorial will have code that might not work as expected if this fix is not added.

Checklist

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Is there an existing issue for this PR?
  • See Redux Essentials Tutorial Part 4 has a type error #3812.
• Have the files been linted and formatted?
• Have the docs been updated to match the changes in the PR?
• Have the tests been updated to match the changes in the PR?
• Have you run the tests locally to confirm they pass?

What docs changes are needed to explain this?

See above.

Bug Fixes

What is the current behavior, and the steps to reproduce the issue?

When the user visits the route /posts/1 or /posts/2, the not found screen appears.

What is the expected behavior?

The post for id 1 or id 2 should display.

How does this PR fix the problem?

This PR adds a .toString() call in a comparison function to fix a type error where the selector was comparing an integer and a string (which will always return false).

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[timdorr]

Thanks!