update nodeRestoreExtendedAttributes() for win

- also other platforms
- move xattr include/exclude filter parsing into
  separate func

Signed-off-by: Tesshu Flower <tflower@redhat.com>

internal/fs/node_xattr_all_test.go

@@ -26,7 +26,8 @@ func setAndVerifyXattr(t *testing.T, file string, attrs []restic.ExtendedAttribu
 		Type:               restic.NodeTypeFile,
 		ExtendedAttributes: attrs,
 	}
-	rtest.OK(t, nodeRestoreExtendedAttributes(node, file, func(_ string) bool { return true } /*restore all xattrs*/))
+	/* restore all xattrs */
+	rtest.OK(t, nodeRestoreExtendedAttributes(node, file, func(_ string) bool { return true }))
 
 	nodeActual := &restic.Node{
 		Type: restic.NodeTypeFile,