Fix #4065: Sometimes normalization brakes twitter intent links.

Fix incorrectly normalized Twitter intent URLs:

    url: https://twitter.com/intent/user?user_id=881080941443239936
    normalized_url: http://twitter.com/intent/

to

    url: https://twitter.com/intent/user?user_id=881080941443239936
    normalized_url: http://twitter.com/intent/user?user_id=881080941443239936/

Fixes about ~1300 incorrectly normalized urls in the production db.

script/fixes/059_fix_twitter_intent_urls.rb

@@ -0,0 +1,11 @@
+#!/usr/bin/env ruby
+
+require_relative "../../config/environment"
+
+# https://github.com/r888888888/danbooru/issues/4065
+def fix_twitter_intent_urls
+  ArtistUrl.without_timeout do
+    urls = ArtistUrl.where(normalized_url: "http://twitter.com/intent/")
+    urls.update_all("normalized_url = regexp_replace(url, '^https', 'http') || '/'")
+  end
+end