refactor to change capacity data type

weed/shell/command_ec_common.go

@@ -282,10 +282,6 @@ func mountEcShards(grpcDialOption grpc.DialOption, collection string, volumeId n
 	})
 }
 
-func divide(total, n int) float64 {
-	return float64(total) / float64(n)
-}
-
 func ceilDivide(total, n int) int {
 	return int(math.Ceil(float64(total) / float64(n)))
 }