Remove plant_fake.txt from tileset directories.

According to Meph, none of these plants grow naturally, and so
their graphics don't matter.

Matrix, Obsidian Soul, and Spacefox tilesets have been adjusted
accordingly. :)
Merge branch 'master' into unified

* master:
  Remove plant_fake.txt from tileset directories.

Conflicts:
	MasterworkDwarfFortress/graphics/Matrix/raw/objects/plant_fake.txt