Update the script to fix enable-lacros

Adjust feature flags as SxS/Primary has been removed
Also fixed typo in the help.

Bug: None


Change-Id: I2ef095c8c50eda73a565dd502a1e8c850b0ad305
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4642488


Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1161972}