[BUG]Posters Removed with a Wrench Turn Invisible and Change into Other Posters

[untrius]

Round ID: 2140

Testmerges: 619, 620, 634

Reproduction:

When a poster is removed from a wall with a wrench, it drops under the player without a sprite. It can then be placed back on the wall, and it will become a random poster.

1. Use a wrench on a poster that's on a wall
2. right click the tile you're standing on, and pick up the invisible poster
3. click the wall to place a random poster

Also, this doesn't work on the default poster (pink and black checkerboard). Instead, it drops with the sprite of a sign. The default poster can also be changed into any sign using a pen.