fix(ci): GitHub App active-PR-limit exemption regression (#75311)

Co-authored-by: openclaw-clawsweeper[bot] <280122609+openclaw-clawsweeper[bot]@users.noreply.github.com>

scripts/github/barnacle-auto-response.mjs

@@ -808,12 +808,12 @@ async function removeLabels(github, context, issueNumber, labels, labelSet) {
         issue_number: issueNumber,
         name: label,
       });
-      labelSet.delete(label);
     } catch (error) {
       if (error?.status !== 404) {
         throw error;
       }
     }
+    labelSet.delete(label);
   }
 }