Issue2469: Correct a typo I introduced at r61793: compilation error with UCS4 builds.

All buildbots compile with UCS2...
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 4df9fd8..68df57d 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -3095,7 +3095,7 @@
                 /* UCS-4 character. Either store directly, or as
                    surrogate pair. */
 #ifdef Py_UNICODE_WIDE
-                *p++ = (Py_UNIC0DE) x;
+                *p++ = (Py_UNICODE) x;
 #else
                 x -= 0x10000L;
                 *p++ = 0xD800 + (Py_UNICODE) (x >> 10);