[Gameplay] - Farms may take multiple seeds when fertile and empty

[xJayMorex]

Bug Submission:

Category: Gameplay

Issue Title: Farms may take multiple seeds when fertile and empty

Issue Description: Easily reproducible, simple bug regarding seed-planting.

Steps to Reproduce: Description:

If a basic or advanced farm is fertile and empty, each nearby player can click on it with a seed in hand. Every player will walk to the farm and attempt to plant their seed all of which will be consumed.

Expected mechanic:

First player to arrive to the farm plants their seed, remaining players should get the "can't do that" error message upon arriving. Seeds should stay in their inventory.