Replace TheFreeDictionary with Collins' as default dictionary

dotfiles/saturnin/www.ini

 [www.query]
 
     cd      = http://www.collinsdictionary.com/dictionary/english/%s
-    d       = http://www.thefreedictionary.com/%s
+    d       = http://www.collinsdictionary.com/dictionary/english/%s
     dd      = http://devdocs.io/%s
     deb     = https://packages.debian.org/search?keywords=%s
     g       = http://www.google.com/search?q=%s