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Fix waveguide dimensions in mode-converter adjoint-optimization tutorial #2658

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Run time

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Job	Run time
Test Python 3.9 with MPI (false)	22m 50s
Test Python 3.9 with MPI (true)	36m 54s
Test Python 3.11 with MPI (false)	24m 33s
Test Python 3.11 with MPI (true)	36m 12s
	2h 0m 29s