Fix compilation error.

Introduced recently when refactoring the match rules, forgot to update
all call sites, and the bug went unnoticed for a while, oops. Not sure
the fix is all we need to get back a working feature (alter schema
rename to), but it allows to compile and that's all I have the time to
handle today.

See #466.

src/parsers/command-alter-table.lisp

@@ -74,8 +74,7 @@
   (:lambda (alter-schema-command)
     (bind (((_ _ current-name _ _ new-name) alter-schema-command))
       (pgloader.catalog::make-match-rule
-       :type :string
-       :target current-name
+       :rule (make-string-match-rule :target current-name)
        :action #'pgloader.catalog::alter-schema-rename
        :args (list new-name)))))