Merge pull request #4635 from TbishopP/bug_namespace_has_wrong_case

updated case from "Crud" to "CRUD" in CrudButton.php and CrudFilter.php

Author: tabacitu

src/app/Library/CrudPanel/CrudFilter.php

@@ -3,7 +3,7 @@
 namespace Backpack\CRUD\app\Library\CrudPanel;
 
 use Backpack\CRUD\app\Exceptions\BackpackProRequiredException;
-use Backpack\Crud\ViewNamespaces;
+use Backpack\CRUD\ViewNamespaces;
 use Closure;
 use Illuminate\Support\Str;
 use Symfony\Component\HttpFoundation\ParameterBag;