Fix Tools::Image<T> copy constructor
Fix Tools::Image<T> copy constructor

jiawen/Halide,kgnk/Halide,jiawen/Halide,psuriana/Halide,psuriana/Halide,jiawen/Halide,ronen/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,jiawen/Halide,jiawen/Halide,ronen/Halide,ronen/Halide,jiawen/Halide,kgnk/Halide,psuriana/Halide,jiawen/Halide,psuriana/Halide,psuriana/Halide,ronen/Halide,ronen/Halide,ronen/Halide,ronen/Halide,ronen/Halide