Changing time zone + apply has no effect on system time

reactos-bootcd-0.4.15-dev-5018-g5bd03d8-x86-gcc-lin-dbg

As mentionned in CORE-12370 :

• Open Time/Date CPL
• Change time zone : No effect on time (tray....)
• TZ change is only taken into account if you reboot or force manual NTP

Likely related/duplicate of CORE-12987