Photo: iDrop News The latest iPhone 8 rumor out of iDrop News claims Apple is testing two iPhone 8 prototypes, one with a Touch ID sensor on the back and another with the sensors placed under the glass. The new leak—purportedly from a Foxconn employee—supports last week’s images of a supposed rendering of an iPhone with the Touch ID, placing that model in contention with another that would place the sensor on the front like current…