KBArticleOpenSearchImpl lists incorrect name for OpenSearch

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, Master
• Fix Version/s: 7.1.0 Beta 3, 7.1.X, Master
• Component/s: Knowledge Base
• Labels: None
• Story Points: 1
• Fix Priority: 3
• Git Pull Request: https://github.com/sergiogonzalez/liferay-portal/pull/4453

Reproduction Steps:
1. Add a search portlet to a page. In the configuration menu, go to Other Settings > Enable Display Open Search Results.
2. Use the search portlet to search for something.
3. Scroll to where the Open Search results are listed, look at the line listing the classes that have been searched.

Expected Results: KBArticle is listed as "Knowledge Base Article"
Actual Results: KBArticle is listed as "model.resource."