Align description with run description

[Asfolny]

Comparing against ASMLevel30 and level-23/DESCRIPTION.md reveals
(red is the class in run, green is the description)

most_common_byte(src_addr, size):
  i = 0
  while i <= size-1:
    curr_byte = [src_addr + i]
    [stack_base - curr_byte * 2] += 1
    i += 1

-   b = 0
+  b = 1
  max_freq = 0
  max_freq_byte = 0
-  while b <= 0xff:
+  while b <= 0x100
    if [stack_base - b * 2] > max_freq:
      max_freq = [stack_base - b * 2]
      max_freq_byte = b
    b += 1

  return max_freq_byte

Maybe it's worth adding a warning/note and/or renaming "stack_base" to "list_base", because when doing this my dumbass forgot about the fact that rsp contains the return pointer, since the function is called; or maybe I'm just a dumbass that forgot

[zardus]

@mahaloz, does this look accurate to you?

[mahaloz]

@zardus the changes to the DESCRIPTION file align with the original intention of level 23, so I'd say yes. Private link to the original (you should have access): https://github.com/mahaloz/EmbryoASM/blob/a1308ed2cf310e85cbb13df19158f5a2aa1a213e/embryoasm.py#L1780

[zardus]

Sweet, thanks!