MuonRecExample: Fix TGC configuration - use useTGCPriorNextBC and set to False by default.
Since about 2008 or so, we have moved (in offline at least) from having three TGC containers to one (
TGC_MeasurementsAllBCs). This MR just sets the relevant flag properly and fixes some related configuration.
Since this might affect the trigger, I'm going to use full-unit-tests