Update a few item icons' filenames.

diff --git a/items/dowsing-mchn.png b/items/dowsing-machine.png
similarity index 100%
rename from items/dowsing-mchn.png
rename to items/dowsing-machine.png

diff --git a/items/nevermeltice.png b/items/never-melt-ice.png
similarity index 100%
rename from items/nevermeltice.png
rename to items/never-melt-ice.png

diff --git a/items/parlyz-heal.png b/items/paralyze-heal.png
similarity index 100%
rename from items/parlyz-heal.png
rename to items/paralyze-heal.png

diff --git a/items/x-defend.png b/items/x-defense.png
similarity index 100%
rename from items/x-defend.png
rename to items/x-defense.png