Issue template: Remove kind/bug label added by default (#7813)

There are many false positive. It is better to tag the bugs manually
while adding priority and component.

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,6 @@
 name: Bug report
 about: Create a report to help us improve.
 title: ''
-labels: kind/bug
 assignees: ''
 ---