detachables: create menu items for legacy screens

Previously, we didn't require any action on these legacy screens, so
didn't update current_screen when displaying these.  Now, will be
adding language switching and debug display for these screens, so need
to keep track of them.

BUG=b:65470853, b:67371896, b:64400036
BRANCH=None
TEST=None

Change-Id: I2bab22fcbb0bb3cdfffe585eb633231ba8015fc3
Signed-off-by: Shelley Chen <shchen@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/676269
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
1 file changed