Added default values to BaseEngine.ini for reference
#ROBOMERGE-AUTHOR: andrew.grant
#ROBOMERGE-SOURCE: CL 21204775 via CL 21204944 via CL 21207221 via CL 21207247 via CL 21208631
#ROBOMERGE-BOT: UE5 (Release-Engine-Staging -> Main) (v972-20964824)
[CL 21211418 by andrew grant in ue5-main branch]