fix: simplify issue number validation check

Agent-Logs-Url: https://github.com/th30d4y/.github/sessions/3ebd0ea0-050b-490d-88d6-b63460c4e3a8

Co-authored-by: Stalin-143 <161853795+Stalin-143@users.noreply.github.com>

Author: Copilot

.github/workflows/org-bot.yml

@@ -92,7 +92,7 @@ jobs:
             const repo = context.repo.repo;
 
             try {
-              if (issueNumber == null || Number.isNaN(issueNumber) || issueNumber <= 0) {
+              if (Number.isNaN(issueNumber) || issueNumber <= 0) {
                 core.setFailed("Unable to determine issue/pull request number for comment.");
                 return;
               }