Remove Strict Validate Path Type `false` from Nginx

[Richard87]

This was added for compatibility with Cert-Manager, but should not be needed any more. (Fixed in https://github.com/kubernetes/ingress-nginx/pull/13798)

Ref: https://cert-manager.io/docs/releases/release-notes/release-notes-1.18/#option-2-disable-the-strict-validate-path-type-option-in-ingress-nginx

strict-validate-path-type: "false"