ninja: properly use mariadb claim

basic/apps/ninja/invoiceninja-values-configmap.yaml

@@ -21,6 +21,7 @@ data:
       auth:
         password: "${mariadb_password}"
         rootPassword: "${mariadb_root_password}"
+      primary:
         persistence:
           existingClaim: invoiceninja-mariadb
     redis:
@@ -28,7 +29,6 @@ data:
       auth:
         password: "${redis_password}"
 
-    debug: true
     appURL: "https://ninja.ftt.gmbh"
     userEmail: "${admin_email}"
     userPassword: "${password}"