migration: Fix migrate_test_apply for multifd parameters

They were missing when introduced on the tree

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
diff --git a/migration/migration.c b/migration/migration.c
index 98429dc..fb62a63 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -865,6 +865,12 @@
     if (params->has_block_incremental) {
         dest->block_incremental = params->block_incremental;
     }
+    if (params->has_x_multifd_channels) {
+        dest->x_multifd_channels = params->x_multifd_channels;
+    }
+    if (params->has_x_multifd_page_count) {
+        dest->x_multifd_page_count = params->x_multifd_page_count;
+    }
 }
 
 static void migrate_params_apply(MigrateSetParameters *params)