The edit text object for the passphrase textline is created with an
empty string literal "", rather than pointing to the textline's buffer.
This means that when the user types, tline->buf is updated but the text
object still displays the original empty string.
Fix this by creating the edit text object with abuf_data(&tline->buf) so
it points to the textline's buffer. This matches how expo_build.c
creates textlines for cedit.
Co-developed-by: Claude <claude@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
f2278377be