Use same code for decode Explorer.Chain.Hash and Explorer.Chain.Code

apps/explorer/lib/explorer/chain/hash.ex

@@ -196,8 +196,8 @@ defmodule Explorer.Chain.Hash do
     hexadecimal_digit_count = byte_count_to_hexadecimal_digit_count(byte_count)
 
     with ^hexadecimal_digit_count <- String.length(hexadecimal_digits),
-         {integer, ""} <- Integer.parse(hexadecimal_digits, 16) do
-      cast_integer(integer, byte_count)
+         {:ok, bytes} <- Base.decode16(hexadecimal_digits, case: :mixed) do
+      {:ok, %__MODULE__{byte_count: byte_count, bytes: bytes}}
     else
       _ -> :error
     end