From https://macosxautomation.com/mavericks/guiscripting/reset.html

reset.applescript

tell application "System Preferences"
	launch
	activate
	
	reveal anchor "Privacy_Assistive" of pane id "com.apple.preference.security"
	
	
	display alert "RESET ACCESSIBILITY APPROVAL LIST" message "This script will reset (clear) the list of applications in the Accessibility section of the Privacy system preference pane." & linefeed & linefeed & "This action requires an administrative password, and cannot be undone." as critical buttons {"Cancel", "Reset"} cancel button "Cancel"
	
	set show all to true
	
	do shell script "tccutil reset Accessibility" with administrator privileges
	
	delay 1
	
	reveal anchor "Privacy_Accessibility" of pane id "com.apple.preference.security"
end tell