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Warn when on the last page, not second-to-last

src/Monitoring/ThreadStats.coffee

@@ -45,5 +45,5 @@ ThreadStats =
       for thread in page.threads
         if thread.no is ThreadStats.thread.ID
           ThreadStats.pageCountEl.textContent = page.page
-          (if page.page is @response.length - 1 then $.addClass else $.rmClass) ThreadStats.pageCountEl, 'warning'
+          (if page.page is @response.length then $.addClass else $.rmClass) ThreadStats.pageCountEl, 'warning'
           return