Fixing wrong calculation of C-grid velocities in Peninsula example Field #297

Job	Run time
py3.12 \| macos \| integration tests	14m 25s
py3.12 \| macos \| unit tests	8m 48s
py3.12 \| ubuntu \| integration tests	18m 30s
mypy	3m 46s
py3.12 \| ubuntu \| unit tests	13m 57s
py3.12 \| windows \| integration tests	31m 48s
py3.12 \| windows \| unit tests	21m 35s
py3.10 \| ubuntu \| unit tests	13m 16s
py3.11 \| ubuntu \| unit tests	12m 32s
merge-test-artifacts	12s
	2h 18m 49s

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