fixed screen flick at startup

[nicbus]

Hi,

while looking at the samourai wallet code to take inspiration for a project of ours we faced some issues and fixed them.

We feel it would be beneficial to samourai wallet if these fixes were merged, so please consider this pull request.

Thanks for this project and keep up the good work!

[InvertedX]

can you update this with latest changes.. use develop as base branch