Remove the batch size parameter in the control-flow based LSTM tests in lite_v2_test.py. Also update the comment.
Remove the batch size parameter in the control-flow based LSTM tests in lite_v2_test.py. Also update the comment.

PiperOrigin-RevId: 365175492
Change-Id: I56b14ecaa705726013064ee70d2a940ef1a30937

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