Remove a check that led to bogus errors.
Remove a check that led to bogus errors.

Of note, this forbade `unit sub MAIN($x where { $x > 1 }); ...` - that
is, any use of a `where` in a blockless sub MAIN. After some fiddling,
I couldn't work out what useful purpose it served, and no spectests
become unhappy as a result of removing it, so I'll consider it a
thinko.

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