modified MuonQuality option. Changed from LowPtEfficiency to LowPt to be consistent with MCP tools

The option for LowPt muon quality was set to "LowPtEfficiency" in AnalysisTop. By selecting this option in the config files, this cause a crash due to the fact that in the MCP trigger tool (that is initialised in AT), the name of this quality option is "LowPt". I changed the name in TopMuonCPTool.cxx to be consistent with the MCP tools name convention. You can find more information in this ticket ANALYSISTO-782

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