Move MAX_DATE_STR define under DATE_FMT_STR check
Move MAX_DATE_STR define under DATE_FMT_STR check

If DATE_FMT_STR is set to a custom value, MAX_DATE_STR needs
to be set too.

clach04/watchface_framework,clach04/watchface_starwars_rebel_imperial,clach04/watchface_framework,clach04/watchface_colony,clach04/watchface_storm_trooper,clach04/watchface_framework,clach04/watchface_rota_minute,clach04/watchface_simple_step,clach04/watchface_starwars_rebel_imperial,clach04/pebble_tz,clach04/watchface_simple_step,clach04/watchface_colony,clach04/watchface_colony,clach04/watchface_starwars_rebel_imperial,clach04/watchface_rota_minute,clach04/watchface_simple_step,clach04/watchface_storm_trooper,clach04/watchface_colony,clach04/watchface_storm_trooper,clach04/pebble_tz,clach04/watchface_rota_minute,clach04/pebble_tz