BURs: don't update OP when approving BUR.

When approving or rejecting a BUR, don't edit the OP forum post to add
an EDIT: line stating the request has been approved. Instead just let
the embedded BUR state who it was approved by, and post a reply saying
that the request has been approved.

test/unit/bulk_update_request_pruner_test.rb

@@ -19,7 +19,7 @@ class BulkUpdateRequestPrunerTest < ActiveSupport::TestCase
 
       BulkUpdateRequestPruner.reject_expired
       assert_equal("rejected", bur.reload.status)
-      assert_match(/rejected because it was not approved within 60 days/, bur.forum_post.body)
+      assert_match(/rejected because it was not approved within 60 days/, ForumPost.second.body)
     end
   end
 end

test/unit/bulk_update_request_test.rb

@@ -422,10 +422,6 @@ class BulkUpdateRequestTest < ActiveSupport::TestCase
         @ti = TagImplication.where(:antecedent_name => "bar", :consequent_name => "baz").first
       end
 
-      should "reference the approver in the automated message" do
-        assert_match(Regexp.compile(@admin.name), @bur.forum_post.body)
-      end
-
       should "set the BUR approver" do
         assert_equal(@admin.id, @bur.approver.id)
       end
@@ -481,29 +477,6 @@ class BulkUpdateRequestTest < ActiveSupport::TestCase
         assert_equal("pending", @req.status)
       end
 
-      should "update the topic when processed" do
-        assert_difference("ForumPost.count") do
-          @req.approve!(@admin)
-        end
-
-        assert_match(/approved/, @post.reload.body)
-      end
-
-      should "update the topic when rejected" do
-        @req.approver_id = @admin.id
-
-        assert_difference("ForumPost.count") do
-          @req.reject!(@admin)
-        end
-
-        assert_match(/rejected/, @post.reload.body)
-      end
-
-      should "reference the rejector in the automated message" do
-        @req.reject!(@admin)
-        assert_match(Regexp.compile(@admin.name), @req.forum_post.body)
-      end
-
       should "not send @mention dmails to the approver" do
         assert_no_difference("Dmail.count") do
           @req.approve!(@admin)