fix: repair the line continuation in the failure handler

The step that comments on the issue when a review run dies carried a literal
backslash instead of a line continuation, so gh received four arguments and
--repo ran as a command of its own. The handler for failures would itself have
failed, silently, and only when something had already gone wrong.

bash -n does not catch this: the syntax is valid, the meaning is not. Checking
run blocks now also means looking for a doubled backslash at end of line.

Issue: #114
User-Visible: no

.github/workflows/process.yml

@@ -337,5 +337,5 @@ jobs:
 
           Если вердикт выше всё же опубликован — сбой произошёл после него. Перестановку метки в этом случае выполняет чат обслуживания или владелец, но не автор задачи: автор не толкует вердикт о своей же работе.
           EOF
-          gh issue comment "${{ github.event.issue.number }}" \\
+          gh issue comment "${{ github.event.issue.number }}" \
             --repo "${{ github.repository }}" --body-file /tmp/failure.md