bts/BTS_Tests.default: bump default PCUIF version to 11

Without this change I cannot run BTS_Tests manually anymore:

Local verdict of MTC: fail reason:
    "BTS_Tests.ttcn:480 : Invalid PCU Version/BTS Number received"

Change-Id: If0046b44adb93fba7dced1ce06d5ddb9d7c75269
Fixes: 3b4abb86 "BTS_Tests: Add support for PCUIF protocol version 11"
1 file changed