vboot/ui: Force to reacquire log on initialization

Force to reacquire a newer firmware log snapshot every time when the
user enters the firmware log screen.

Re-entering (e.g. back from language selection or debug info tab) will
still show the cached firmware log string.

BUG=b:146399181, b:168442372
TEST=make clean && make runtests
TEST=Build locally, navigate to the firmware log screen,
     go back, and enter the firmware log screen again.

Cq-Depend: chromium:2409742
Change-Id: I8c3eea23446c58603ce698a86f1aca4b264ebb0e
Signed-off-by: Hsuan Ting Chen <roccochen@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2411761
Commit-Queue: Yu-Ping Wu <yupingso@chromium.org>
4 files changed