fix(app): Fixes a typo in the ClearSettings command that was stopping execution

[lonnieezell]

When running spark settings:clear it was throwing an error because of a typo on the service it was calling.

Call to a member function flush() on null

at VENDORPATH/codeigniter4/settings/src/Commands/ClearSettings.php:20

This adds the required s to make it settings and allow the command to run.

[kenjis]

Can you run composer cs-fix?

[lonnieezell]

Can you run composer cs-fix?

Since none of those style errors are related to this PR should I update the baseline or go ahead and include them in this since this is a simple enough change it won't get lost amongst the noise?

Eh, I'll just fix it so they don't harass more in the future I guess.

Edit: and of course running cs-fix on my local machine didn't fix all of the errors /sigh

[lonnieezell]

ok, ran composer update and that seemed to have fixed it.

[kenjis]

Thank you.

Certainly the changes in style has nothing to do with this PR, so the PR should be separated as it should be.
However, if the commits are separated, I think it is acceptable.
The style changes and fix are both small changes.