changed subdetector name from CSC to MUON_CSC_ENDCAP_A_SIDE and MUON_CSC_ENDCAP_C_SIDE

Mario Campanellirequested to merge
campanel/athena:atr21370b into master

the subdetector name CSC has been changed to the appropriate values, and the cscmon chain has been renamed HLT_cscmon_CSCPEB_L1All

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