[Bug] Different Behavior on "az repos pr create" and web interface

**Describe the bug**
When creating a merge from the interface ALL work-items from the git commit command are linked to the PR. while doing the command line the work-items need to be enumerated with the switch "--work-items" otherwise we need to do manually on the web interface afterward. It upset my team as we carefully enlist our work-items on commits. Some of my developers are stoping to link on commits... intruding bad behavior. please fix it soon.

**To Reproduce**
-Azure-Devops extension version:
azure-cli 2.0.81 *
-Extensions:
azure-devops 0.17.0

Steps to reproduce the behavior:
1. login using az login...
2. Commit changes to az git repos, link by adding the '#'+Work-item. Az DevOps website form will automatically link to the work-item
3. c:\[project git directorie]>az repos pr create -t develop