refactor(components/fatfs): replace assert expression (IDFGH-14473)

[safocl]

assert expressions in the diskio_wl.c file contains a magical calculations. This PR replaces them with an equality check.

before:
assert(wl_handle + 1);
after:
assert(wl_handle != WL_INVALID_HANDLE);

Related

Fixes #15246

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[github-actions]

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⚠️

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📖	You might consider squashing your 3 commits (simplifying branch history).

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