Armorlab - Variance node has a shared text input

[limarest]

ArmorPaint version: Armorlab commit 7bc8676

OS/device including version: Windows 11, DirectX11, RTX3070

Issue description: When adding multiple variance nodes, the text prompt inside is shared between all of them, making it impossible to add multiple variance stages

https://github.com/armory3d/armortools/assets/30127298/75c6b07d-1685-48af-841d-378af8939d00

Steps to reproduce:

1. Create a project
2. Add two variance nodes
3. Type a text inside a node - it updates on both of them