Fix GroverOptimizer's rotation_count (backport #132)

[mergify]

This is an automatic backport of pull request #132 done by Mergify.
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	new file:   releasenotes/notes/fix-grover-rotation-count-853baefc6b7e8476.yaml

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	both modified:   qiskit_optimization/algorithms/grover_optimizer.py
	both modified:   test/algorithms/test_grover_optimizer.py

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[t-imamichi]

I close this because #137 is merged.