Boeing ND: fix active waypoint drawing

Gijs de Rooyrequested to merge
cherry-pick-d53f9196 into release/2024.1

Also reinit waypoints when their index changes. This prevents waypoints from having a stray index when an upstream waypont is deleted.

(cherry picked from commit d53f9196)

Co-authored-by: Gijs de Rooy gijsrooy@hotmail.com

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