Tiny typo in animate-config.json

The filenames are case-sensitive, right?

Found the issue because I copied all the classNames from this file so that I could apply random animations in my JS.  The `"animationend"` callbacks failed once in a while - found it was because the `lightSpeedIn` and `lightSpeedOut` didn't have the same case in this file vs. in `animate.css`, so the CSS animations were never getting triggered, thus no `"animationend"` event..  Also, looking at the Gruntfile, and the `lightSpeedIn.css` and `lightSpeedOut.css` filenames, it looks like this file needs to be corrected anyway.  Hopefully this will help people avoid the bug I created, and also improve the build script.