After getting spooked and throwing its mounted officer yesterday, Aldo the police horse managed to make its way home to the station house at 6th Ave. and Ericcson Pl. Aldo freaked out at the sound of screeching brakes in Soho yesterday afternoon, causing him to throw his rider, who was taken to St. Vincent's with minor injuries. After getting the cop off his back, Aldo ran free through the streets before ambling about ten blocks......