msc/USSD: drop the TC_lu_and_ussd_wrong_code test case

As we are about to finish the implementation of GSM TS 09.11, in
our case it is 'SS/USSD over GSUP', OsmoMSC will not decide itself
which USSD request-code is known, and which is wrong.

Change-Id: Ic104a49bb2dce2127063bcef8443ee6b639c9f19
2 files changed