The widow of “Gone Girl” actress Lisa Banes said Thursday it was “unbelievable” that e-bikes were still running amok five years after her wife was killed in a horrific hit-and-run — as Mayor Zohran Mamdani ends the city’s criminal crackdown. Kathryn Kranhold, 66, told The Post she thought it was “wrong” to stop doling out criminal penalties to runaway e-bike drivers, given the obvious havoc the two-wheeled terrors create in the city. “I haven’t read the specifics, but I do know from firsthand