Resolve duplicate field entries in farm field module window.

[armele]

Closes discord observations: https://discord.com/channels/139070364159311872/1003402487417548801/1491852568102441141

Changes proposed in this pull request

• Ensure that the BlockScarecrow bottom is used always for registration, even if the top is clicked.

Steps to reproduce (prior to code fix):

• Start new colony.
• Place farm with no field.
• Place field.
• Set seed from TOP half of scarecrow.
• Observe that field is duplicated in the farm field module window (once with selected seed, once without).

Testing post-code fix is to follow the same process and observe only one entry.

Review please

[github-actions]

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[armele]

Please remove the "untested" label. Testing was performed as described in the PR.

[armele]

Please remove the "Untested" label. Thanks!