Use SlotsSequenceElement to render servers with corrupt shares

This was previously not implemented; leaving it as such.

src/allmydata/web/check_results.py

@@ -800,11 +800,10 @@ class DeepCheckAndRepairResultsRendererElement(Element, ResultsBase, ReloadMixin
 
     @renderer
     def servers_with_corrupt_shares(self, req, tag):
-        return [] # TODO
-
-    @renderer
-    def server_problem(self, req, tag):
-        pass
+        # TODO: this was originally unimplemented before porting to
+        # twisted.web.template; leaving it as such.
+        corrupt = []
+        return SlotsSequenceElement(tag, corrupt)
 
     @renderer
     def remaining_corrupt_shares_p(self, req, tag):

src/allmydata/web/deep-check-and-repair-results.xhtml

@@ -52,8 +52,8 @@
 <div t:render="servers_with_corrupt_shares_p">
 <h2>Servers on which corrupt shares were found</h2>
 <ul t:render="servers_with_corrupt_shares">
-  <li t:pattern="item" t:render="server_problem"/>
-  <li t:pattern="empty">None</li>
+  <li t:render="item"/>
+  <li t:render="empty">None</li>
 </ul>
 </div>