update getPSF in tools

# Setup Chip

chip = Chip(chipID=chipID, config=config)

print('chip.bound::', chip.bound.xmin, chip.bound.xmax, chip.bound.ymin, chip.bound.ymax)

for iobj in range(nobj):

    print("\nget psf for iobj-", iobj, '\t', 'bandpass:', end=" ", flush=True)

    # Setup Position

    # Setup Position on focalplane

    x, y = imgPos[iobj, :] # try get the PSF at some location (1234, 1234) on the chip

    x = x+chip.bound.xmin

    y = y+chip.bound.ymin

    pos_img = galsim.PositionD(x, y)

    # Setup sub-bandpass