Fix per token atrributes bits

[jaime-m-p]

See #7685 (comment).

[github-actions]

📈 llama.cpp server for bench-server-baseline on Standard_NC4as_T4_v3 for phi-2-q4_0: 551 iterations 🚀

Expand details for performance related PR only

• Concurrent users: 8, duration: 10m
• HTTP request : avg=8521.08ms p(95)=21321.49ms fails=, finish reason: stop=497 truncated=54
• Prompt processing (pp): avg=95.77tk/s p(95)=424.22tk/s
• Token generation (tg): avg=37.95tk/s p(95)=47.37tk/s
• ggml-org/models/phi-2/ggml-model-q4_0.gguf parallel=8 ctx-size=16384 ngl=33 batch-size=2048 ubatch-size=256 pp=1024 pp+tg=2048 branch=per-token-attribs commit=f95c7dc7104fb4516a1dacbada5546e979194323

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