Fixed L1 emulation sequence for FastSim to be compliant with postLS customisations for CSC

This is a set of changes to make the L1 emulation for FastSim work properly when postLS1Customisation is called.
It implies changing the module naming convention for L1 emulation, changes were agreed with FastSim conveners and STORM.
The most evident effect should be an improvement in the final efficiency of HLT paths using muons in FastSim sequences.