fix missing xCalcDebCost

Tangi Poirierrequested to merge
tpoirier/ECM:fix-Db-Opt into master

Fix missing xCalcDebCost in functions: xCheckRDCostIBCMode xCheckRDCostInterIMV xCheckRDCostInterMultiHyp2Nx2N xCheckRDCostInterWoOBMC

Results are -0.01% in RA for 1s encoding

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