models: set more creator names explicitly.

Set creators explicitly for bans, BURs, comment votes, and posts.

test/unit/mod_action_test.rb

@@ -10,8 +10,8 @@ class ModActionTest < ActiveSupport::TestCase
     should "hide ip addresses from non-moderators in ip ban modactions" do
       as(@mod) { create(:ip_ban, ip_addr: "1.1.1.1", reason: "test") }
 
-      as(@user) { assert_equal(0, ModAction.search({}).count) }
-      as(@mod) { assert_equal(1, ModAction.search({}).count) }
+      assert_equal(0, ModAction.visible(@user).count)
+      assert_equal(1, ModAction.visible(@mod).count)
     end
   end
 end