[6.x] Fixes Lumen loadViewsFrom issue retrieving view config before the component is loaded

[kieranbrown]

PHP 7.4 introduces a new error on a fresh install of Lumen when using the loadViewsFrom method:

Steps to recreate:

• Fresh Lumen installation
• $app->register(Illuminate\Pagination\PaginationServiceProvider::class);

Proposed solution

Assign the view factory to a variable before iterating the config so that Lumen can register the view component first.