Fix partially composite profile setup

Commit ecb7ed0 substituted
"composite-profile?" for the "map?" predicate in this conditional. This
change was a mistake; it made the mapping operation a no-op as composite
profiles (= vectors) do not themselves contain composite profiles. The
change was also unrelated to the stated purpose of the commit.

That change is undone here, "composite-profile?" is reverted back to
"map?".

leiningen-core/src/leiningen/core/project.clj

@@ -380,8 +380,7 @@
   (if (composite-profile? raw-profile)
     ;; TODO: drop support for partially-composite profiles in 3.0
     (with-meta
-      (mapv #(cond-> % (composite-profile? %) setup-profile-with-empty)
-            raw-profile)
+      (mapv #(cond-> % (map? %) setup-profile-with-empty) raw-profile)
       (meta raw-profile))
     (let [empty-defaults (select-keys empty-meta-merge-defaults
                                       (keys raw-profile))]