creating tame vermin (pets) in gui/create-item results in mangled data

[myk002]

as per https://discord.com/channels/793331351645323264/1017471248567124049/1232483204347330631

[quietust]

To clarify, the vermin items are somehow ending up with a race of -1 and a caste consisting of the specified race.

The bug is entirely inside gui/create-item.lua and/or modtools/create-item.lua, since the createitem plugin creates vermin correctly (tested with createitem VERMIN ANT:QUEEN and createitem PET ANT:SOLDIER and both came out correctly).

[myk002]

is it worth replacing logic in gui/create-item and/or modtools/create-item with a call to createitem?

[quietust]

They're both calling the same code inside the Items module - the only difference is in how they translate user-provided inputs into numeric IDs, and I'm not sure whether it makes sense for them to share that (because createitem takes them in "custom reaction" format, while gui/create-item takes them from menu selections).