Comment out efforts to have local profiles load custom data

As I originally noted in BGAnimations/ScreenSelectMusic
overlay/loadProfilesHack.lua :

LoadProfileCustom() is normally called via Metrics.ini under [Profile]
this does work for profiles on USB memory cards, but not local profiles
so these two commands are defined  here to load local profiles

Those two commands (PlayerJoinedMessage and On) were my efforts to
manually load local profiles and were causing more problems (custom
options constantly resetting when going between screens) than they were
solving.

For now, I’m commenting the whole thing out.

Also, ScreenTitleMenu underlay now resets custom option env variables
for PLAYER_1 and PLAYER_2.

Finally, I created a new function in Scripts/SL-CustomProfiles to
handle that resetting.