'issue_body' obsolete in templates

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,7 +1,6 @@
 name: 🪲 Report a bug
 description: Create a bug report to help improve Marlin Firmware
 title: "[BUG] (bug summary)"
-issue_body: true
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -2,7 +2,6 @@ name: ✨ Request a feature
 description: Request a new Marlin Firmware feature
 title: "[FR] (feature summary)"
 labels: 'T: Feature Request'
-issue_body: true
 body:
   - type: markdown
     attributes: