Update tests to adapt new type of fields in resource

The type has been changed to Option type.

Signed-off-by: Tim Zhang <tim@hyper.sh>

tests/resources.rs

@@ -16,8 +16,7 @@ fn pid_resources() {
     {
         let res = Resources {
             pid: PidResources {
-                update_values: true,
-                maximum_number_of_processes: MaxValue::Value(512),
+                maximum_number_of_processes: Some(MaxValue::Value(512)),
             },
             ..Default::default()
         };