Update check files affected by a fix to addbyte.c in libcurses.

branches: 1.4.2;
Update check files to allow for changes due to fixes to libcurses.

Update to account for default colour change in libcurses.

Update the check files to account for fixes to addstr.c

branches: 1.1.2;
New tests and updates for corrected behaviour due to fix for PR56224
* Added extra testing to the addstr test to demonstrate bug described
in PR#56224 and validate case when scrolling enabled still works.
* Fixed slk test, the slk_init output changed due to corrected wrapping,
slk_restore no longer returns ERR probably due to addwchar no longer
returning ERR when an implicit scroll was attempted when scrolling
disabled. Commented out the slk_wset test, this is now returning ERR
instead of misbehaving, needs investigation.