fix parallel_tasks form

tmpl/index.tmpl

@@ -31,7 +31,7 @@
     </select>
     <input type="submit" value="Submit">
 </form>
-<h2>Set Queue Enable</h2>
+<h2>Set Parallel Tasks</h2>
 <form method="POST" action= "/parallel_tasks">
     <label for="worker">Worker:</label>
     <select id="worker" name="worker">
@@ -41,7 +41,7 @@
         {{end}}
     </select>
     <label for="parallel_tasks">Parallel Tasks</label>
-    <select id="parallel_tasks" name="enable">
+    <select id="parallel_tasks" name="parallel_tasks">
         <option value="1">1</option>
         <option value="2">2</option>
         <option value="3">3</option>