Fix d5a7b850: Action 4 data broken for nforenum.

[PeterN]

Data for action 4 is two lists. In d5a7b85, only the second list was updated.

Make both sets of data the correct length.

Before:

$ ./nforenum test.nfo
NFORenum 6.2.0-1-gf5837f8 - Copyright (C) 2025-12-09 by Dale McCoy
Processing file "test.nfo".
Failed to load data file: "4.dat". (/home/petern/src/grfcodec/src/strings.cpp:53)
nforenum: /home/petern/src/grfcodec/src/data.cpp:1291: int _CheckEOF(int, files, const char*, int): Assertion `false' failed.
Aborted

After:

$ ./nforenum test.nfo
NFORenum 6.2.0-2-gc7811d3 - Copyright (C) 2025-12-09 by Dale McCoy
Processing file "test.nfo".
Processing complete.

[rubidium42]

Would something like static_assert(std::size(_dat4) == 2 + 1 + (_dat4[2] + 1) * 2 + 1); after the table be a good idea to prevent such issues in the future?