Fix test for not_equals null
Fix test for not_equals null

Null gets cast as empty string so is actually true, even though the datatypes are initially different.
natanfelles/CodeIgniter4,samsonasik/CodeIgniter4,butane/CodeIgniter4,lonnieezell/CodeIgniter4,kenjis/CodeIgniter4,bcit-ci/CodeIgniter4,gustavojm/CodeIgniter4,lonnieezell/CodeIgniter4,kenjis/CodeIgniter4,natanfelles/CodeIgniter4,jim-parry/CodeIgniter4,jim-parry/CodeIgniter4,butane/CodeIgniter4,jim-parry/CodeIgniter4,bcit-ci/CodeIgniter4,ytetsuro/CodeIgniter4,lonnieezell/CodeIgniter4,ytetsuro/CodeIgniter4,samsonasik/CodeIgniter4,kenjis/CodeIgniter4,ytetsuro/CodeIgniter4,gustavojm/CodeIgniter4,kenjis/CodeIgniter4,lonnieezell/CodeIgniter4,butane/CodeIgniter4,butane/CodeIgniter4,lonnieezell/CodeIgniter4,ytetsuro/CodeIgniter4,natanfelles/CodeIgniter4,ytetsuro/CodeIgniter4,natanfelles/CodeIgniter4,butane/CodeIgniter4,natanfelles/CodeIgniter4,kenjis/CodeIgniter4,bcit-ci/CodeIgniter4,samsonasik/CodeIgniter4,jim-parry/CodeIgniter4,ytetsuro/CodeIgniter4,bcit-ci/CodeIgniter4,lonnieezell/CodeIgniter4,butane/CodeIgniter4,jim-parry/CodeIgniter4,bcit-ci/CodeIgniter4,samsonasik/CodeIgniter4,natanfelles/CodeIgniter4,samsonasik/CodeIgniter4,gustavojm/CodeIgniter4,gustavojm/CodeIgniter4,jim-parry/CodeIgniter4,samsonasik/CodeIgniter4