Fix: Mvpidx bit of SMVD mode is not counted when --DMVD=0 and both MVP candidates are identical

Merged Chun-Chi Chen requested to merge chunchic/ecm-4:ECM5_FixSMVD_MvpidxBitCount into master

At encoder, when TM-AMVP is turned off by using "--DMVD=0", the Mvpidx bit of SMVD mode is not counted in the case when both AMVP candidates in MVP candidate list are identical.

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