Encoder fix for JVET-N0415-CTB-ALF

Nan Hurequested to merge
nanh/VVCSoftware_VTM:JVET-N0415-EncFix into master

Encoder fix for JVET-N0415-CTB-ALF: when re-deriving new filters in the CTB loop getFilterCoeffAndCost() should only return cost related to filter.

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