travelmate: update 2.4.5-2

travelmate: update 2.4.5-2

- gated config sanity checks at the end of travelmate-functions.sh
   behind 'trm_action' to fix init script enable/disable/help paths
- added a ubus socket guard around f_system to harden against pre-ubus sourcing
- added a 'trm_bver' fallback in f_log for sourcing paths without prior f_system execution
- reordered system utility references before system library sourcing,
   so f_log has a valid 'trm_logcmd' available if the library check fails
- minor code improvements

Signed-off-by: Dirk Brenken <redacted>