library/RSL_Types.ttcn: expect any l3_info for 'tr_RSL_UNITDATA_*' by default

This is quite useful when one needs to expect an RSL UNITDATA
message with any payload. Let's set 'l3_info' to '?' by default,
like it's already done for 'ts_RSL_DATA_*'.

Change-Id: I45260343b34d8d054e7efa72de11dd4cb510a8cc
1 file changed