[Hotfix] Fix ClearSpawnTimers() (#4073)

# Notes
- This wasn't a part of my other pull request.
- We were clearing `spawn2_list` before using it in `ClearSpawnTimers()`.

zone/zone.cpp

@@ -1898,6 +1898,10 @@ void Zone::Repop(bool is_forced)
 		return;
 	}
 
+	if (is_forced) {
+		ClearSpawnTimers();
+	}
+
 	LinkedListIterator<Spawn2 *> iterator(spawn2_list);
 
 	iterator.Reset();
@@ -1905,10 +1909,6 @@ void Zone::Repop(bool is_forced)
 		iterator.RemoveCurrent();
 	}
 
-	if (is_forced) {
-		ClearSpawnTimers();
-	}
-
 	npc_scale_manager->LoadScaleData();
 
 	entity_list.ClearTrapPointers();