gui: Avoid unnecessary strdup's and replace newlines by spaces in curses output.

gui: Avoid unnecessary strdup's and replace newlines by spaces in curses output.

align_str() made a copy of the given buffer because one of its callers, print_in_bar(),
passes a string literal and align_str() needs to truncate large strings.However, all other
callers pass a writable string anyway, so do the strdup() in print_in_bar(). This avoids the
unnecessary copies for each status item.

The areas for the status items was designed to hold only a part of a single line, so status
item text should not contain newlines. The patch replaces newlines by spaces.

Also get rid of a stale comment.