Fixed bug in hubbe_search() on wide strings.
The last character for 16-bit wide and last three characters
for 32-bit wide haystack strings was missed.
This bug was probably hard to trigger in practice, since
the hubbe_search() method is only used for needles longer
than 34 characters and satisfying some other more obscure
criteria, and to be triggered also requires a haystack of
a specific length compared to the needle.