Breed xp test: tame both llamas (AbstractHorse.canParent)

With the vanilla data present the untamed pair never bred, so the
test failed; without it the test returned early and passed vacuously.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

crates/horizon-client/src/mobs/goals.rs

@@ -3241,12 +3241,15 @@ mod breed_xp_tests {
         });
         let kind = kind?;
         let mut partner = Mob::new(2, kind.clone(), Vec3::new(2.5, 64.0, 0.5), 0.0);
+        // AbstractHorse.canParent: only tame llamas breed.
+        partner.extra.tame = true;
         partner.extra.in_love = 600;
         let seen = [partner.seen(None)];
         let mut out = None;
         crate::mobs::world::with_built_test_world_rules(&seen, true, drops, shelf, |w, _| {
             let mut m = Mob::new(1, kind, Vec3::new(0.5, 64.0, 0.5), 0.0);
             m.extra.in_love = 600;
+            m.extra.tame = true;
             let mut lr = LegacyRandom::new(0);
             let mut events = Vec::new();
             for _ in 0..600 {