MAINT: remove unused imports from _multidim.py
MAINT: remove unused imports from _multidim.py

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