Potential fix for building inside vehicles

Changelog

🆑 Morrow

bugfix: No longer able to use sandstone to bypass construction checks.

/🆑

Details

The "on_floor" flag was set to 0 rather than 1 and was bypassing the check for constructing on certain turfs. Other tile creation options seem to just create a place-able tile in hand but this would instead replace the turf underneath it.

Let me know if someone wants this fixed a different way.

Related Issues

Closes #695 (closed)