[#31675] Remove last uses of JRequest in Joomla

Combined with #3677 this should remove all instances of JRequest from Joomla - which paves the way for it's removal in J4.0 :D

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=31675

Looking at the next line, it looks like `e_name` may contain more characters than what is only allowed in the CMD filter? I'd use a less restrictive one here unless you know for sure it doesn't break anything.