mtmd: quick fix token order

[bluebread]

Make sure to read the contributing guidelines before submitting a PR

@sfallah This bug was because I forgot to add token swapping logic... sorry for that. The decoding should work now. FYI here are the result and my test settings.

[sfallah]

@bluebread
no problem,
While debugging, I tried some exising (gemma3) and ran to the "marker" issue with old working models.
My fix locally (not committed yet) changes for fixing the issue with existing models is below.
Can you please have a look at, and please test with som existing models.

I am e.g. using:

build/bin/llama-mtmd-cli \
-hf ggml-org/Qwen2.5-VL-3B-Instruct-GGUF:Q4_K_M \
--image tools/mtmd/test-1.jpeg \
-p "what is the publisher name of the newspaper?" \
--temp 0 -n 128

[bluebread]

@sfallah Fixed it. Will be more careful next time...