vocabs.cache: Reset the all-disk-vocabs-recursive memoized every time a vocab is loaded.
vocabs.cache: Reset the all-disk-vocabs-recursive memoized every time a vocab is loaded.

Test case if "fuel.pprint" is not loaded:
all-disk-vocabs-recursive filter-vocabs [ vocab-name "fuel.pprint" = ] filter
"fuel.pprint" load
all-disk-vocabs-recursive filter-vocabs [ vocab-name "fuel.pprint" = ] filter
! vocab-link
! vocab

Fixes #2545

factor/factor,mrjbq7/factor,factor/factor,factor/factor,tgunr/factor,tgunr/factor,mrjbq7/factor,factor/factor,mrjbq7/factor,tgunr/factor,mrjbq7/factor,tgunr/factor,tgunr/factor,factor/factor,mrjbq7/factor,tgunr/factor,factor/factor,mrjbq7/factor