fix(port): Fix farm greenhouse floors. Add metal floors to grain bins.

[0Monet]

Purpose of change

Use "t_dirtfloor" under the display racks in "ranch_camp_57".
Put metal floor on level 0 of the farm and ranch silos, as this makes sense since the other silos use metal floor.
Use "t_open_air_rooved" inside the ranch silo.
Fix the greenhouse floor in the farm by using "t_dirtfloor" under the planters.

Describe the solution

JSON changes.
Port CleverRaven/Cataclysm-DDA#56124

Describe alternatives you've considered

Do nothing.

Testing

1. I go to the farm and ranch.
2. No problems.

Additional context

Before:
"ranch_camp_57":

"farm_1":

After:

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