cleanup duplicate key 'days-before-close' from stale.yml

Author: sudo87

.github/workflows/stale.yml

@@ -41,7 +41,6 @@ jobs:
           days-before-pr-close: 240
           exempt-issue-labels: 'gsoc,good-first-issue,long-term-plan'
           exempt-pr-labels: 'status:ready-for-merge,status:needs-testing,status:on-hold'
-          days-before-close: -1
       - uses: actions/stale@v10
         with:
           stale-issue-label: 'archive'