Fix pull request sample template

A null reference survived an earlier implementation.

Signed-off-by: James Turley <jamesturley1905@googlemail.com>

.changeset/witty-rats-bake.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder-backend': patch
+---
+
+Fix bug in pull request sample template.

plugins/scaffolder-backend/sample-templates/pull-request/template.yaml

@@ -69,8 +69,9 @@ spec:
           {{#if parameters.description}}
           {{parameters.description}}
           {{/if}}
-        host: '{{parameters.host}}'
         targetPath: '{{#if parameters.targetPath}}{{parameters.targetPath}}{{else}}{{parameters.name}}{{/if}}'
 
   output:
-    remoteUrl: '{{steps.publish.output.remoteUrl}}'
+    links: 
+      - url: '{{steps.publish.output.remoteUrl}}'
+        text: 'Go to PR'