[cleanup] Remove redundant checks for opentiles #768
Merged
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Follow-up to DFHack/df-structures#612
First half for fixing DFHack/dfhack#3526
Since the semantic change in the structure PR, "walkable" is equivalent to "able to stand on". Many tools had this check written as "not an open tile", which is now redundant with the "walkable" attribute. Remove the redundant checks.
Note: I've only tested deep-embark with these changes, but I think it's quite safe