Note that I don't use this tweak, yet (I like my Move2Unlock tweak), but maybe the developer is using the stock "slide to unlock" text file and has just changed it to be "fold to unlock"?
So, what if you went into iFile and changed the text? Go look in System/Library/CoreServices/SpringBoard.app/English.lproj/SpringBoard.strings and search for AWAY_LOCK_LABEL.
If that "fold to unlock" text is there, you know that's what the developer did and so then you can just delete the phrase (leaving the quotes).
Maybe that'll do it?
Marilyn
P.S. And just in case, in the address, "English.lproj" is for whatever language you are running. I would assume you'd have to use your own language folder if you aren't using English...