Align "wrong number of arguments" messages

Make "N for M" into the form "given N, expected M".

As I worked, I noticed that the `argnum_error()` function had a part to include the method name in the message.
I think this part is no longer needed by https://github.com/mruby/mruby/pull/5394.

  - Before this patch

    ```console
    % bin/mruby -e '[1, 2, 3].each 0'
    trace (most recent call last):
            [1] -e:1
    -e:1:in each: 'each': wrong number of arguments (1 for 0) (ArgumentError)
    ```

  - After this patch

    ```console
    % bin/mruby -e '[1, 2, 3].each 0'
    trace (most recent call last):
            [1] -e:1
    -e:1:in each: wrong number of arguments (given 1, expected 0) (ArgumentError)
    ```

1 files changed, 1 insertions, 7 deletions

diff --git a/src/vm.c b/src/vm.c
index 65af8dcc0..84ec08cfe 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -963,13 +963,7 @@ argnum_error(mrb_state *mrb, mrb_int num)
   if (argc == 0 && mrb->c->ci->nk != 0 && !mrb_hash_empty_p(mrb, mrb->c->ci->stack[1])) {
     argc++;
   }
-  if (mrb->c->ci->mid) {
-    str = mrb_format(mrb, "'%n': wrong number of arguments (%i for %i)",
-                     mrb->c->ci->mid, argc, num);
-  }
-  else {
-    str = mrb_format(mrb, "wrong number of arguments (%i for %i)", argc, num);
-  }
+  str = mrb_format(mrb, "wrong number of arguments (given %i, expected %i)", argc, num);
   exc = mrb_exc_new_str(mrb, E_ARGUMENT_ERROR, str);
   mrb_exc_set(mrb, exc);
 }