Use ndarray.size instead of multiplying

[nanosec]

Use binary_mask.size instead of multiplying the elements of binary_mask.shape.

[github-actions]

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🔍 Inspect the changes: https://github.com/datacarpentry/image-processing/compare/md-outputs..md-outputs-PR-338

The following changes were observed in the rendered markdown documents:

 07-thresholding.md | 13 +++----------
 LICENSE.md         |  6 +++---
 md5sum.txt         |  4 ++--
 3 files changed, 8 insertions(+), 15 deletions(-)

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⏱️ Updated at 2025-02-05 16:53:09 +0000

[K-Meech]

Looks good to me - thanks @nanosec ! This is a nice simplification over using the width/height of the image.
I'll leave this open for a few more days, in case the other maintainers have comments - otherwise I'll merge it later this week 😄