Remove unused POST method for message replies

This action just shows the pre-filled form, with the target for
the form being the same as for new messages.

test/controllers/messages_controller_test.rb

@@ -32,10 +32,6 @@ class MessagesControllerTest < ActionController::TestCase
       { :path => "/message/reply/1", :method => :get },
       { :controller => "messages", :action => "reply", :message_id => "1" }
     )
-    assert_routing(
-      { :path => "/message/reply/1", :method => :post },
-      { :controller => "messages", :action => "reply", :message_id => "1" }
-    )
     assert_routing(
       { :path => "/message/delete/1", :method => :post },
       { :controller => "messages", :action => "delete", :message_id => "1" }