Hard to read e2e key backup dialog on the dark theme

[turt2live]

(blue tint is my custom tint)

related: #2988

[jryans]

I am assuming this is currently low priority as the dark theme is rethought and E2E dialogs are soon to get detailed mockups. I would assume one or both of these projects will improve this.

[aaronraimist]

This got fixed in the new dark theme