Silences towels from announcing that they've dried off.

The description even says to wait for a while, so why should they
announce it out loud? It makes no sense unless maybe they're talking
plutonium-powered robotowels or something.
Merge branch 'towel-message-silencer' of https://github.com/Rivet-the-Zombie/Cataclysm-DDA into Rivet-the-Zombie-towel-message-silencer
map.cpp fix

Nails it outside of inventory, too.
Merge branch 'Rivet-the-Zombie-towel-message-silencer'