Fixed plant analyzer crash when the plant graft gives reagent gene, rather than trait gene [NO GBP] (#89089)

## About The Pull Request


![image](https://github.com/user-attachments/assets/3d4c5d7a-904c-4b63-a6c8-8c65e1a490da)

Didn't know that some plants have reagent traits defined for grafted
traits.

It didn't work because the trait_db contained only subtypes of
`/datum/plant_gene/trait`, but not `/datum/plant_gene/reagent`.

## Why It's Good For The Game

Fix

## Changelog

🆑
fix: Fixed plant analyzer UI crashing on plants that have a reagent gene
on their graft
fix: Plants with reagent traits in the graft now properly say the name
of the grafted reagent
/🆑

code/_globalvars/lists/objects.dm

@@ -104,5 +104,3 @@ GLOBAL_LIST_INIT(prototype_organs, typecacheof(list(
 	/obj/item/organ/eyes/dullahan,
 ), only_root_path = TRUE))
 
-/// list of all plan traits
-GLOBAL_LIST_INIT(plant_traits, init_plant_traits())