STYLE: remove unused variable (vtm writer)

src/fileFormats/vtk/file/foamVtmWriter.C

@@ -314,20 +314,13 @@ void Foam::vtk::vtmWriter::dump(Ostream& os) const
 
 Foam::vtk::vtmWriter::vtmWriter()
 :
-    vtmWriter(true, false)
+    vtmWriter(true)
 {}
 
 
 Foam::vtk::vtmWriter::vtmWriter(bool autoName)
-:
-    vtmWriter(autoName, false)
-{}
-
-
-Foam::vtk::vtmWriter::vtmWriter(bool autoName, bool autoCollapse)
 :
     autoName_(autoName),
-    autoCollapse_(autoCollapse),
     hasTime_(false),
     entries_(),
     blocks_(),

src/fileFormats/vtk/file/foamVtmWriter.H

@@ -176,9 +176,6 @@ class vtmWriter
         //- Auto-generate names from 'file' entry?
         bool autoName_;
 
-        //- Collapse empty blocks and combine block/dataset etc.
-        bool autoCollapse_;
-
         //- Has a TimeValue for FieldData?
         bool hasTime_;
 
@@ -214,9 +211,6 @@ public:
         //- Construct with specified behaviour for autoName
         explicit vtmWriter(bool autoName);
 
-        //- Construct with specified behaviour for autoName, autoCollapse
-        vtmWriter(bool autoName, bool autoCollapse);
-
 
     //- Destructor
     ~vtmWriter() = default;