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

ArmorLab_VlOoiHruCc.mp4

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