library/PCUIF_Types.ttcn: mark PCUIF_Text as 'null_terminated'

This is a TITAN specific attribute that allows to indicate that
a field of type 'charstring' is '\0'-terminated. Without that
attribute, 'PCUIF_Text' is mixed with the padding characters:

  "0.7.0.5-df0f" & char(0, 0, 0, 0) & char(0, 0, 0, 0) & ...

Change-Id: Ic81fff4c82871bb29a2385b9ee7a2dd98f67dfb0
1 file changed