gui: Update airports.xml

Henning Stahlkerequested to merge
cherry-pick-cb3170ef into release/2024.1

Round magnetic heading and add RW length in meters to runway info. see also #3236

(cherry picked from commit cb3170ef)

Co-authored-by: Henning Stahlke 6759206-henning.stahlke@users.noreply.gitlab.com

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