[Wayland] Rofi icons flickers on startup


### Discussed in https://github.com/davatorium/rofi/discussions/2160

<div type='discussions-op-text'>

<sup>Originally posted by **mazksr** July 17, 2025</sup>
https://github.com/user-attachments/assets/4d1920f4-f4c5-4519-af11-8bd327a83738

Happens on every theme with icons. Even the built-in ones.</div>


Version: pre 2.0 release after merge.