[Bug] Overwrite existing custom RSDB entries

[Echocolat]

When a mod that adds one or multiple PouchActorInfo entry(ies) has an option that edit one or multiple of said entry(ies) in its own PouchActorInfo, TKMM generates duplicate entries instead, which is an issue because the game picks the first entry which would ignore completely the entry coming from the enabled option. (in example file, the option adds the SpiceBoostSuccessRate field to the Item_Enemy_901 entry)