Fix an issue that multi muon trigger(>= 3 muons) chains don't work, ATR-20136

I would like to merge these changes into master.
This fixes an issue reported on ATR-20136. I confirmed that these changes don't have any effect to other chains by test_trigUpgr_full_menu_mc_build.

Trigger/TrigHypothesis/TrigMuonHypoMT/src/TrigMufastHypoTool.cxx

@@ -273,7 +273,7 @@ StatusCode TrigMufastHypoTool::decide(std::vector<MuonClusterInfo>& toolInput) c
       ATH_MSG_DEBUG("Applying selection of single << " << m_decisionId );
       return inclusiveSelection(toolInput);
    } else {			// in case of HLT_2mu6 and so on.
-      if ( numMuon == 1 ) {	// If RoIs have only 1 muon, multipul selection wouldn't run.
+      if ( numTrigger > numMuon ) {	// If RoIs have numTrigger > numMuon(E.g RoI has 2 muons in 3mu6 chain), multipul selection wouldn't run.
          ATH_MSG_DEBUG("Number of muon event = " << numMuon );
          ATH_MSG_DEBUG("Not applying selection " << m_decisionId << " because of " << numMuon << " muon" );
       } else {			// IF RoIs have some muon, multipul selection would run.