added 'not available on classic pebble' message on enable health option
added 'not available on classic pebble' message on enable health option

lfhbento/timeboxed-watchface,hussin/timeboxed-watchface,lfhbento/timeboxed-watchface,hussin/timeboxed-watchface,lfhbento/timeboxed-watchface,hussin/timeboxed-watchface,lfhbento/timeboxed-watchface,lfhbento/timeboxed-watchface,hussin/timeboxed-watchface