flags: remove uploader targeting restrictions.

Remove restrictions against flagging too many posts by the same
uploader. This had problems with preventing legitimate flags in some
cases, particularly with old legacy content. This will be policed
manually instead.

test/unit/post_flag_test.rb

@@ -51,24 +51,6 @@ class PostFlagTest < ActiveSupport::TestCase
         assert_equal(["have already flagged this post"], @post_flag.errors[:creator_id])
       end
 
-      should "not be able to target a single uploader" do
-        travel_to(2.weeks.ago) do
-          as(@alice) do
-            @posts = FactoryBot.create_list(:post, 10, uploader: @alice)
-          end
-        end
-
-        as(@bob) do
-          travel_to(1.week.ago) do
-            @flags = @posts.map {|x| PostFlag.create(reason: "bad #{x.id}", post: x)}
-          end
-
-          @bad_flag = PostFlag.create(post: @post, reason: "bad #{@post.id}")
-        end
-
-        assert_equal(["You cannot flag posts uploaded by this user"], @bad_flag.errors.full_messages)
-      end
-
       should "not be able to flag more than 10 posts in 24 hours" do
         as(@bob) do
           @post_flag = PostFlag.new(post: @post, reason: "aaa", is_resolved: false)