Apps Stuck in Security & Privacy > Accessibility
Within Terminal you can run the following command to see the current entries in your system.

sudo sqlite3 /Library/Application\ Support/com.apple.TCC/Tcc.db 'select * from access'


And then this command to remove an entry you don't want any longer.

sudo sqlite3 /Library/Application\ Support/com.apple.TCC/Tcc.db 'delete from access where client like "%YOURAPPNAMEHERE%"'


So, for example, I ran the following command which removed Automator from the list.

sudo sqlite3 /Library/Application\ Support/com.apple.TCC/Tcc.db 'delete from access where client like "%Automator%"'


And just to give credit where credit is due, I found the solution on Apple's discussion forums here.

Another option to find a list of applications which have requested Accessibility access is the following command. This will give you the list of application which have been allowed and the ones that haven't.

defaults read com.apple.universalaccessAuthWarning