Removed BP3Base template struct defaults

source/adios2/toolkit/format/bp3/BP3Base.h

@@ -324,9 +324,9 @@ protected:
     {
         uint64_t Offset;
         uint64_t PayloadOffset;
-        T Min = T();
-        T Max = T();
-        T Value = T();
+        T Min;
+        T Max;
+        T Value;
         std::vector<T> Values;
         uint32_t Step;
         uint32_t FileIndex;