contextMenu: Don't store route places

Flag coordinate-based places used for
the route from/to/via menus to not be
stored in the place store. As these
places contains no names, it makes
no sense, and it actually isn't
supported by the place store and
gives a GtkListStore warning.
1 job for gnome-40 in 9 minutes and 48 seconds
Status Job ID Name Coverage
  Test
failed #1314387
flatpak
flatpak

00:09:48

 
Name Stage Failure
failed
flatpak Test
Uploading artifacts for failed job
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WARNING: gnome-maps-git.flatpak: no matching files
WARNING: repo.tar: no matching files
WARNING: .flatpak-builder/build/gnome-maps/_flatpak_build/meson-logs/meson-log.txt: no matching files
WARNING: .flatpak-builder/build/gnome-maps/_flatpak_build/meson-logs/testlog.txt: no matching files
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Cleaning up file based variables
ERROR: Job failed: exit code 1