nfs: TX are not unidirectional

NFS transactions are not unidirectional so we should not declare
them as such.

rust/src/nfs/nfs.rs

@@ -2075,7 +2075,7 @@ pub unsafe extern "C" fn rs_nfs_udp_register_parser() {
         get_tx_data: rs_nfs_get_tx_data,
         get_state_data: rs_nfs_get_state_data,
         apply_tx_config: None,
-        flags: APP_LAYER_PARSER_OPT_UNIDIR_TXS,
+        flags: 0,
         truncate: None,
         get_frame_id_by_name: Some(NFSFrameType::ffi_id_from_name),
         get_frame_name_by_id: Some(NFSFrameType::ffi_name_from_id),