unirec++: skip type check for std::byte fields in UnirecRecord

Avoid calling getExpectedUnirecType for std::byte fields in
checkDataTypeCompatibility(), since byte buffers are handled as
raw data and don't have a defined Unirec type mapping.

Author: Pavel Siska

unirec/include/unirec++/unirecRecord.hpp

@@ -339,7 +339,9 @@ class UnirecRecord {
 		if (ur_is_array(fieldID)) {
 			expectedType = getExpectedUnirecType<RequiredType*>();
 		} else {
-			expectedType = getExpectedUnirecType<RequiredType>();
+			if constexpr (!std::is_same_v<RequiredType, std::byte>) {
+				expectedType = getExpectedUnirecType<RequiredType>();
+			}
 		}
 
 		if (expectedType != ur_get_type(fieldID)) {