The opensearch config playbook was iterating over opensearch_services,
generating a file named opensearch-dashboards.yml containing an empty
JSON dictionary. The next task was generating opensearch_dashboards.yml
which is actually used by OpenSearch Dashboards.

Remove with_dict in the first task to only generate opensearch.yml.

Change-Id: I39cf74916630d27cd34ce0783ba8c3c0d20bbddc