Fixing wrong calculation of C-grid velocities in Peninsula example Field #296

Job	Run time
py3.12 \| macos \| integration tests	14m 20s
py3.12 \| macos \| unit tests	10m 24s
mypy	3m 47s
py3.12 \| ubuntu \| integration tests	18m 6s
py3.12 \| ubuntu \| unit tests	13m 36s
py3.12 \| windows \| integration tests	24m 33s
py3.12 \| windows \| unit tests	22m 44s
py3.10 \| ubuntu \| unit tests	12m 44s
py3.11 \| ubuntu \| unit tests	12m 34s
merge-test-artifacts	1s
	2h 12m 49s

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