[cleanup] remove deprecates Throttle.lastwait property
[cleanup] remove deprecates Throttle.lastwait property

lastwait is deprecated for 3 years and FutureWarning is thrown with 4.1.0

Change-Id: Ide774aceee499cefd34b8e0cdfac0388e2c0c51f

wikimedia/pywikibot-core,wikimedia/pywikibot-core