create an empty file (or, if that's easier for you, an empty directory works just as well) and just name it "uninstall" without any extensions. This inside the .screensaver directory which should have been created when you installed the mod.
Edit: Oh, I guess it won't work for you either, since it only checks for uninstall whenever it's about to display the screensaver, which it doesn't do for you, so ... you're kind of stuck with it :P
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