Be forgiving of wonky EDTF dates

[thisisaaronland]

This should not stop execution.

./bin/wof-sqlite-index-features -timings -all -dsn /usr/local/data/whosonfirst-us.db /usr/local/data/whosonfirst-data-admin-us/

...
12:23:46.520745 [wof-sqlite-index-features] STATUS time to index ancestors (146328) : 46.299296315s
12:23:46.520749 [wof-sqlite-index-features] STATUS time to index all (146328) : 10m0.091664497s
2021/08/11 12:24:22 time to index paths (1) 10m36.180485986s
12:24:22.610799 [wof-sqlite-index-features] FATAL Failed to index paths in repo:// mode because: Failed crawl callback for /usr/local/data/whosonfirst-data-admin-us/data/102/531/225/102531225.geojson: Invalid EDTF string '192x' (Extended Interval)
12:24:22.610814 [wof-sqlite-index-features] FATAL Failed to index paths in repo:// mode because: Failed crawl callback for /usr/local/data/whosonfirst-data-admin-us/data/102/531/225/102531225.geojson: Invalid EDTF string '192x' (Extended Interval)