Nation Zones preventing sieges

[Firav]

Describe the bug
Per the request of @LlmDl, Im filing this report.
Nation zones around towns prevent banners for sieges to be placed, essentially making them invincible to siege.

To Reproduce
Steps to reproduce the behavior:

1. Enable nation zones
2. Go to border of town
3. Attempt to place banner for siege

Expected behavior
Upon placement of a banner, a siege of the town should commence.

Versions (please complete the following information):

• Towny: 0.97.1.0
• SiegeWar: 0.4.0
• Paper: git-Paper-783

[LlmDl]

So what I've found, is that when you're not out of date, you can start a siege but the banner is not placed.

I think I've already got a fix made up which shouldn't break anything else though.

[Firav]

Alright. Let me know and I can throw it into a test environment.