MAINT: Pre-multiply rec_hi coeffs
MAINT: Pre-multiply rec_hi coeffs

Rather than setting and negating the coefficient, just pre-multiply it.
Makes it easier to see which coefficients are affected.

eriol/pywt,kwohlfahrt/pywt,kwohlfahrt/pywt,michelp/pywt,michelp/pywt,rgommers/pywt,rgommers/pywt,michelp/pywt,grlee77/pywt,PyWavelets/pywt,eriol/pywt,kwohlfahrt/pywt,PyWavelets/pywt,grlee77/pywt,rgommers/pywt,eriol/pywt,rgommers/pywt