Remove sizes from Nextcloud keys

They default to 4096, and I don't want to have to bump them up as necessary

roles/nextcloud/tasks/main.yml

@@ -120,11 +120,9 @@
       - name: Create ACME account key
         openssl_privatekey:
           path: "/etc/pki/cert/private/account.key"
-          size: 4096
       - name: Create certificate key
         openssl_privatekey:
           path: "/etc/pki/cert/private/{{ nextcloud_url }}.key"
-          size: 4096
       - name: Create CSR
         openssl_csr:
           path: "/etc/pki/cert/csr/{{ nextcloud_url }}.csr"