tower attack kindof fix (!434)

Description

Added missing kindof for attacking structures to Angmar Den, Angmar Forge, Angmar Temple of Twilight and Gondor Stable (fix no specific changelog)

 

Checklist

I have:

• Tagged my change with the ;,; comment block.
• Ensured that this merge request changes exactly one thing.
• Attached the proper labels to this merge request.
• Added the Merge Request number in the title. e.g. (!42)
• Tested my code.