Aye, I have switched the commands /mppon will actually hide it currently and /mppoff will show them again. My bad
You need to turn around the 2 lines here so they look like this:
Lua Code:
SLASH_COMMANDS["/mppon"] = function() toggle_MapPingFromPlayers(false) end
SLASH_COMMANDS["/mppoff"] = function() toggle_MapPingFromPlayers(true) end
Updated the zip archive.