Brief flash of default logo before custom logo loads

[omer-al-ba]

When using a custom company logo in Cryptgeon, the old default logo briefly appears before it’s replaced by the custom one. This creates a short flicker effect when loading the page.

Steps to reproduce:

1. Configure Cryptgeon with a custom logo.
2. Load or refresh the main page.
3. Observe that the default logo flashes for a moment before the custom one is displayed.

Expected behavior:
The custom logo should display immediately, without showing the default one first.

Suggestion:
Maybe the default logo could only be rendered if no custom logo is set, or the loading logic could be adjusted so the custom logo is shown directly.

[Narcoleka]

Ok