posts: drop img.ly source normalization.

There are only two posts from this site and the site itself is defunct:

* https://danbooru.donmai.us/posts/1561685
* https://danbooru.donmai.us/posts/1412508
* https://img.ly/ofxl

app/models/post.rb

@@ -449,12 +449,6 @@ class Post < ApplicationRecord
       when %r{\Ahttp://(?:(?:(?:img\d?|cdn)\.)?rule34\.xxx|img\.booru\.org/(?:rule34|r34))(?:/(?:img/rule34|r34))?/{1,2}images/\d+/(?:[a-f0-9]{32}|[a-f0-9]{40})\.}i
         "https://rule34.xxx/index.php?page=post&s=list&md5=#{md5}"
         
-      when %r{\Ahttps?://(?:s3\.amazonaws\.com/imgly_production|img\.ly/system/uploads)/((?:\d{3}/){3}|\d+/)}i
-        imgly_id = $1
-        imgly_id = imgly_id.gsub(/[^0-9]/, '')
-        base_62 = imgly_id.to_i.encode62
-        "https://img.ly/#{base_62}"
-        
       when %r{(\Ahttp://.+)/diarypro/d(?:ata/upfile/|iary\.cgi\?mode=image&upfile=)(\d+)}i
         base_url = $1
         entry_no = $2