hlr/HLR_EUSE.ttcn: remove redundant code from f_main_mo()

There is no need to pass session state from f_main_mo() to a
choosen EUSE handler (e.g. f_ss_echo), because a handler
itself is capable to extract the session state IE.

Change-Id: I1054baf3e7dafd05b797610b586e6202740f07b6
1 file changed