Drop redundant k clamp in _mpdist_vect and _aampdist_vect

[DMZ22]

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• Ran flake8 --extend-exclude=.venv ./ in the root stumpy directory
• Ran ./setup.sh dev && ./test.sh in the root stumpy directory

On the last item: I'm on Windows, so instead of ./test.sh I ran the two affected suites directly — pytest tests/test_mpdist.py tests/test_aampdist.py → 82 passed. Happy to run anything else you'd like. black reported 99 files unchanged and flake8 was clean.

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Closes #1082.

P_ABBA is allocated as np.empty(2 * j, ...), so P_ABBA.shape[0] - 1 is 2 * j - 1. That means the k = min(int(k), P_ABBA.shape[0] - 1) on the following line already applies exactly the same upper bound as the min(..., 2 * j - 1) inside the if k is None branch, so the inner clamp is redundant:

P_ABBA = np.empty(2 * j, dtype=np.float64)

if k is None:
    percentage = np.clip(percentage, 0.0, 1.0)
    k = math.ceil(percentage * (2 * Q.shape[0]))   # inner min(..., 2*j-1) removed

k = min(int(k), P_ABBA.shape[0] - 1)               # already bounds k by 2*j-1

Applied to aampdist as well, as you noted on the issue.

Why it's behaviour-preserving

min(min(a, b), b) == min(a, b), and the int() is a no-op because math.ceil already returns an int. I also checked it empirically over 20,000 randomised (n, m, percentage) combinations — including percentage values outside [0, 1] so the clipping path is exercised — and the resulting k was identical in every case.

[gitnotebooks]

Review these changes at https://app.gitnotebooks.com/stumpy-dev/stumpy/pull/1158

[github-actions]

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