OPSK-860 - hide monthly stats option (and wf stats)

was biovel specific, and doesn't appear to currently work. Hidden, but keep page should biovel still need it in the future.
Also only show workflow stats if workflows_enabled

Author: stuzart

app/views/admins/_stats.html.erb

@@ -1,14 +1,17 @@
 <div class="form-group form-inline">
+  <%
+     options = [["Select query ...","none"],
+                ["Content Statistics","contents"],
+                ["Activity Statistics","activity"],
+                ["Search Statistics","search"],
+                ["Job queue","job_queue"],
+                ["Auth table consistency","auth_consistency"]
+     ]
+     options = options | [["Workflow Statistics", "workflow_stats"]] if Seek::Config.workflows_enabled
+  %>
+
   <%= select_tag :stats_query,
-                 options_for_select([["Select query ...","none"],
-                                     ["Content Statistics","contents"],
-                                     ["Activity Statistics","activity"],
-                                     ["Search Statistics","search"],
-                                     ["Job queue","job_queue"],
-                                     ["Auth table consistency","auth_consistency"],
-                                     ["Monthly User Statistics", "monthly_stats"],
-                                     ["Workflow Statistics", "workflow_stats"]
-                                    ],:length=>10),
+                 options_for_select(options,:length=>10),
                  {:class => 'form-control',
                   :onchange=>remote_function(:url=>get_stats_admin_path(:element=>"stats_list"),
                                              :with=>"'id='+this.value",