test: migrate math/base/special/logitf to ULP-based assertions

[Planeshifter]

Summary

Resolves a part of #11352.

Migrates math/base/special/logitf test cases from the relative tolerance idiom (delta/tol computed via EPS) to ULP-difference-based assertions using @stdlib/number/float32/base/assert/is-almost-same-value, per the RFC in #11352.

• test/test.js and test/test.native.js updated.
• A single named ULP constant (1) is used in each test file.
• Measured minimum: computed the actual ULP difference between logitf output and the fixture-provided expected values (via @stdlib/number/float32/base/ulp-difference) across all three fixtures (small, medium, large); the maximum observed difference was 1 ULP, so ULP = 1 is the tightest bound that still passes.
• No conversion of expected values was needed since the Python fixture generator already stores expected as float32-rounded values (.astype(np.float32)), unlike some other f-suffixed packages whose fixtures store float64 expected values requiring float64ToFloat32.

Test plan

• Ran test/test.js directly (NODE_PATH=lib/node_modules node .../test.js) — 1507/1507 assertions pass.
• Re-ran twice to confirm determinism at ULP = 1 (no FMA/arch flakiness).
• test/test.native.js runs cleanly and skips (native addon not built in this environment), consistent with existing behavior.
• Confirmed only the two test files changed (no package.json changes needed — no new dependency declarations required in this repo's convention).
• Verified basic ESLint checks (unused vars, undefined vars) pass on the changed files; the repository's full custom eslint-plugin-stdlib config (which pulls in the remark-lint doc-linting toolchain) could not be fully provisioned in this sandbox, but the diff mirrors the exact style/idiom of already-converted sibling packages (e.g. math/base/special/logit, math/base/special/acosf).

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Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/logitf	$\\color{green}192/192$ $\\color{green}+100.00\\%$	$\\color{green}13/13$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}192/192$ $\\color{green}+100.00\\%$

The above coverage report was generated for the changes in this PR.

[kgryte]

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