Fixed #11827 Throw exception when there are no available seats for checkout.

[inietov]

Description

If no available License Seats are found in LicenseCheckoutController::findLicenseSeatToCheckout() function, for some reason the return redirect() statements aren't redirecting but returning an object of type HttpResponse. So I found another way to make the redirect.

Looks kind of gross... but it works now. Let me know if you think it can be done better.

Fixes #11827

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Test Configuration:

• PHP version: 8.1.10
• MySQL version: 8.0.23
• Webserver version: nginx/1.19.8
• OS version: Debian 10

Checklist:

• I have read the Contributing documentation available here: https://snipe-it.readme.io/docs/contributing-overview
• I have formatted this PR according to the project guidelines: https://snipe-it.readme.io/docs/contributing-overview#pull-request-guidelines
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes