[r2193] Bed placement is wonky

I noticed this in the last build as well. I put all my beds in caves and when moving the bed from a stockpile or the ground outside the cave the clearance for the bed, the space around that needs to be free before the bed will be placed, is different depending on if/where the bed is deployed.

how to reproduce:
Make a cave, try to place rows of beds in it, note how bed from different places have different clearances.