remove unused sc::ListenerGroupType::Single

Change-Id: I98a279731b22f88f57ab667b6f5ef8c71b030832
Reviewed-on: https://gerrit.libreoffice.org/63945
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

compilerplugins/clang/unusedenumconstants.readonly.results

@@ -1170,8 +1170,6 @@ sc/inc/types.hxx:38
     enum ScMatValType NonvalueMask
 sc/inc/types.hxx:56
     enum ScFormulaVectorState FormulaVectorDisabledNotInSoftwareSubset
-sc/inc/types.hxx:123
-    enum sc::ListenerGroupType Single
 sc/source/filter/lotus/lotread.cxx:41
     enum STATE S_WK1
 sc/source/ui/inc/viewdata.hxx:43

sc/inc/types.hxx

@@ -120,7 +120,6 @@ enum AreaOverlapType
 
 enum class ListenerGroupType
 {
-    Single,
     Group,
     Both
 };

sc/source/core/data/bcaslot.cxx

@@ -517,10 +517,6 @@ void ScBroadcastAreaSlot::GetAllListeners(
         const ScRange& rAreaRange = pArea->GetRange();
         switch (eGroup)
         {
-            case sc::ListenerGroupType::Single:
-                if (pArea->IsGroupListening())
-                    continue;
-            break;
             case sc::ListenerGroupType::Group:
                 if (!pArea->IsGroupListening())
                     continue;