Treat comma as a commit character for new issue files #1965

Issue Type: Bug

Repro

1. Create a new issue
2. In the Assignees or Labels section, trigger suggestion
3. Press ,

Expected
This should accept the current suggestion

Extension version: 2020.7.2341
VS Code version: Code - Insiders 1.47.0-insider (04545fa88043fd10d1f3edefd26be1b8245b516f, 2020-07-02T05:41:12.081Z)
OS version: Darwin x64 19.5.0