(core) fix bug in new bu2_univ implementation (removed leftover heap push)

Src-commit: b9a14ca6b47097ad57d0c53fbd24fbeb2577d7a5

Author: jfmc

core/engine/term_basic.c

@@ -1099,7 +1099,6 @@ CBOOL__PROTO(bu2_univ, tagged_t term, tagged_t list) {
 #if defined(USE_BUILTIN_ENV)
   /* compute arity first */
   arity = 0;
-  HeapPush(G->heap_top,f);
   tagged_t p = cdr;
   while (TaggedIsLST(p) && arity<MAXARITY1) {
     DerefCdr(p,p);