Remove bug label from issue template (#5955)

Don't label new issues with the bug label by default. We started making
use of issue types, so if anything, this should be type "Bug". However,
we prefer to leave the type unspecified until the issue has been triaged.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,6 +1,5 @@
 name: Bug Report Form
 description: Report an issue related to the Home Assistant Supervisor.
-labels: bug
 body:
   - type: markdown
     attributes: