detect_nonwear wear time calculation does not account for NA

[chanshing]

actipy/src/actipy/processing.py

Line 168 in 0f452db

def detect_nonwear(data, patience='90m', window='10s', stdtol=15 / 1000):

Wear time and nonwear time do not account for NA. The calculation in

actipy/src/actipy/reader.py

Line 233 in 0f452db

total_wear = (t.diff().pipe(lambda x: x[x < tol].sum()).total_seconds())

is correct but gets overwritten by detect_nonwear() info.