Amethyst pitch doesn't work due to typo

The bug

Small and medium amethyst buds are supposed to have their placement sounds pitched down slightly, but this doesn't work because of a typo in the sound definition.

place.medium_amethyst_bud and place.small_amethyst_bud both have a key called pitch: with a colon inside the quotes.

The game should produce a content log warning when a sound entry contains invalid properties.