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
failed #1314387


Name Stage Failure
flatpak Test
Uploading artifacts for failed job
Uploading artifacts...
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
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1