chg: [gitea] ensure ``disable-registration`` is ``true`` by default

gitea/README.org

@@ -14,7 +14,7 @@ gitea:
     config:  ## this entry is merged in app.ini
       #app-name: "Gitea: Git with a cup of tea"
       service:
-        #disable_registration: false
+        #disable-registration: false
         #require-signin-view: false
         #register-email-confirm: false
         #enable-notify-mail: false

gitea/metadata.yml

@@ -16,7 +16,7 @@ default-options:
   config:
     #app-name: "Gitea: Git with a cup of tea"
     service:
-      #disable_registration: false
+      disable-registration: true
       #require-signin-view: false
       #register-email-confirm: false
       #enable-notify-mail: false