E290Display.cpp hardcodes setRotation(3); apply same runtime-rotation pattern as merged E213 PR

[chrisfore]

src/helpers/ui/E290Display.cpp:12 hardcodes display.setRotation(3), same pattern fixed for E213 in #2393. After that PR lands, display_rotation is already in NodePrefs and CLI-addressable — the missing piece is wiring the same override into E290Display (store rotation in a member, apply in begin(), override the virtual setRotation on the base class).

Not picking this up here because I have no E290 hardware to verify the override actually takes effect. Filing so someone with the board can take it on with a short PR.