BTS_Tests.ttcn: fix: properly detect Measurement Reports

The altstep for detecting Measurement Results, that was introduced
in I15782ec93d68a0dc54b2ed7a84cb70d780ba0ce1, was implemented in a
wrong way. Basically, the DL Measurement Reports (coming from the
MS) are being combined with the UL measurements, and then being
send as a RSL_MEAS_RES message, not RSL_INITDATA_IND.

Let's use the existing as_meas_res() in 'lazy' mode for that.

Change-Id: Iea5ee868ede8bfe1e2b1cbf5abcbf2844d3fe9a4
1 file changed