Add bumplock to post modify form, and add set_bump permission

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/templates/board/post_modify_view.html

@@ -5,12 +5,7 @@
 <form method="post" action="{% url 'board:post_modify' post.id %}">
     {% csrf_token %}
     <table>
-    {% if perms.board.set_sticky %}
-    <tr>
-        <th>{{form.sticky.label_tag}}</th>
-        <td>{{form.sticky}}</td>
-    </tr>
-    {% endif %}
+    {{form}}
     <tr><td>&nbsp;</td><td><input type="submit" value="Modify post" /></td></tr>
     </table>
 </form>