Fix set verdict data type unmarshalling

Currently unmarshalling sets with "verdict" data type results in
the "verdict" type to be set as the key type, and the data type
remaining zero.

Properly set the verdict type to Set DataType field instead of
the KeyType.

Signed-off-by: Mikhail Sennikovsky <mikhail.sennikovskii@ionos.com>

set.go

@@ -743,7 +743,7 @@ func setsFromMsg(msg netlink.Message) (*Set, error) {
 			nftMagic := ad.Uint32()
 			// Special case for the data type verdict, in the message it is stored as 0xffffff00 but it is defined as 1
 			if nftMagic == 0xffffff00 {
-				set.KeyType = TypeVerdict
+				set.DataType = TypeVerdict
 				break
 			}
 			dt, err := parseSetDatatype(nftMagic)