TST: fix fswt test precision for np.float16 input
TST: fix fswt test precision for np.float16 input

rgommers/pywt,grlee77/pywt,grlee77/pywt,rgommers/pywt,rgommers/pywt,PyWavelets/pywt,PyWavelets/pywt,rgommers/pywt