vue(components): fix condition in tuple rendering

We don't want to add a trailing comma to the rendered items. Instead, we
want everything _up until_ the last element to be comma-separated.

Change-Id: Ic3ecbb7b3edbdffa8b8d97e5d9094b7e5421adcb

packages/cmk-frontend-vue/src/form/components/FormReadonly.vue

@@ -175,7 +175,7 @@ function renderTuple(
         return h('span', [
           formSpec.show_titles && title ? `${title}: ` : h([]),
           renderForm(element, value[index], elementValidations[index]),
-          index === formSpec.elements.length - 1 && formSpec.layout === 'horizontal' ? ', ' : ''
+          index !== formSpec.elements.length - 1 && formSpec.layout === 'horizontal' ? ', ' : ''
         ])
       })
     ]