github: remove prefix from bugs/features

We already label the issue anyway and this results in reports without
an actual title so remove it. This leaves more space for an actual
useful title.

ref: https://github.com/containers/podman/discussions/17431

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -1,6 +1,5 @@
 name: Bug Report
 description: File a bug report
-title: "[Bug]: "
 labels: ["kind/bug", "triage-needed"]
 body:
   - type: markdown

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -1,6 +1,5 @@
 name: Feature Request
 description: Suggest an idea for this project
-title: "[Feature]: "
 labels: ["kind/feature"]
 body:
   - type: markdown