remove empty title key in template (#5964)

Github issue forms doesn't allow empty keys in their template, removing
`title: ''`


https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/common-validation-errors-when-creating-issue-forms#key-must-be-a-string

## Test plan
N/A
<!-- Required. See
https://docs-legacy.sourcegraph.com/dev/background-information/testing_principles.
-->

## Changelog

<!-- OPTIONAL; info at
https://www.notion.so/sourcegraph/Writing-a-changelog-entry-dd997f411d524caabf0d8d38a24a878c
-->

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,6 +1,5 @@
 name: Bug report (VS Code)
 description: File a bug report to help us improve the VS Code plugin
-title: ''
 labels:
   - bug
   - repo/cody