Remove unneeded AR version conditional code
Remove unneeded AR version conditional code

It seems to be redundant, and tests pass after removing it…

activerecord-hackery/ransack,guilleva/ransack,vaski/ransack,nagyt234/ransack,Eric-Guo/ransack,laserlemon/ransack,outstand/ransack,reinteractive/ransack,praktijkindex/ransack,johan--/ransack,avit/ransack,AndrewSwerlick/ransack,mariorcardoso/ransack,martndemus/ransack,amboxer21/ransack,roman-franko/ransack,Mario245/ransack