fix: excessive float conversion warnings

[bryghtlabs-richard]

Fix warnings of this type by doing comparison more directly:

audio_forge.c: warning: using integer absolute value function 'abs' when argument is of floating-point type 'float' [-Wabsolute-value]
988 | if ((int)(abs((sonic_speed - audio_forge->sonic_speed) * 100)) <= 5) {
013 | if ((int)(abs((sonic_pitch - audio_forge->sonic_pitch) * 100)) <= 5) {

xtensa-esp-elf-gcc.exe (crosstool-NG esp-14.2.0_20251107) 14.2.0

Description

Working through building ESP-ADF example, found I cannot compile esp-codec cleanly, but we can simplify it slightly to make it better.

Testing

!Testing not yet done!

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[bryghtlabs-richard]

Oops - solves same issue as #27