I noticed that I had not quite finished the work of commit 854ed8a, which
removed the test for support for POSIX character classes, as that is now
guaranteed.

In ispell-set-spellchecker-params, there is code that used to be run
conditionally on support for POSIX character classes, which sets all the
CASECHARS and NOT-CASECHARS entries for built-in dictionaries to
[[:alpha:]] and [^[:alpha:]] respectively.

There is no point doing this unconditionally, so instead, put these
character classes directly into the initial values used in
ispell-dictionary-base-alist. This change also makes the variable's
initialization easier to read.

The attached patch makes these changes.

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