default L1Mu CondDbTag from v03 to v04
Changing the default condition tag from OFLCOND-MC16-SDR-RUN2-03 to OFLCOND-MC16-SDR-RUN2-04 for L1Muon simulation. This may improve agreements between rerunLVL1 and online L1 muon performance (being discussed in ATR-23463). In particular, this DB change affects the endcap region. No changes are expected for the barrel region.