Do not autosplat array in block call just because keywords accepted
If the block only accepts a single positional argument plus keywords,
then do not autosplat. Still autosplat if the block accepts more
than one positional argument in addition to keywords.
Autosplatting a single positional argument plus keywords made sense
in Ruby 2, since a final positional hash could be used as keywords,
but it does not make sense in Ruby 3.
Do not autosplat array in block call just because keywords accepted
If the block only accepts a single positional argument plus keywords,
then do not autosplat. Still autosplat if the block accepts more
than one positional argument in addition to keywords.
Autosplatting a single positional argument plus keywords made sense
in Ruby 2, since a final positional hash could be used as keywords,
but it does not make sense in Ruby 3.
Fixes [Bug #18633]