od_filter_dering_direction_*: make int64->int explicit
od_filter_dering_direction_*: make int64->int explicit

clears -Wshorten-64-to-32 warnings

Change-Id: I55231a9a0eec7ade5b06328f386ec19b11860646

smarter/aom,smarter/aom,GrokImageCompression/aom,smarter/aom,GrokImageCompression/aom,smarter/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom