vim-patch:9.0.2183: Maximum callback depth is not configurable (#26703)

Problem:  Maximum callback depth is not configurable.
Solution: Revert patch 9.0.2103.  Set 'maxfuncdepth' in test.

fixes: vim/vim#13732
closes: vim/vim#13736

fe583b1e59

src/nvim/eval.c

@@ -89,8 +89,6 @@
 
 #define DICT_MAXNEST 100        // maximum nesting of lists and dicts
 
-#define MAX_CALLBACK_DEPTH 20
-
 static const char *e_missbrac = N_("E111: Missing ']'");
 static const char *e_list_end = N_("E697: Missing end of List ']': %s");
 static const char e_cannot_slice_dictionary[]
@@ -6061,7 +6059,7 @@ bool callback_call(Callback *const callback, const int argcount_in, typval_T *co
                    typval_T *const rettv)
   FUNC_ATTR_NONNULL_ALL
 {
-  if (callback_depth > MAX_CALLBACK_DEPTH) {
+  if (callback_depth > p_mfd) {
     emsg(_(e_command_too_recursive));
     return false;
   }