[cleanup] remove strm parameter of init_handlers
[cleanup] remove strm parameter of init_handlers

strm parameter of init_handlers was never used neither in compat
nor in core. There is no implementation for it.

Change-Id: I1f16e7bd34d7d1b661844c36ee3f2d03a8f48892

wikimedia/pywikibot-core,wikimedia/pywikibot-core