containers: simplify how ids are appended to a PiercedKernel

Author: DMurataj01

src/containers/piercedKernel.tpp

@@ -1323,9 +1323,7 @@ typename PiercedKernel<id_t>::FillAction PiercedKernel<id_t>::fillAppend(id_t id
     validateId(id);
 
     // Add the id
-    m_ids.emplace_back();
-    id_t &storedId = m_ids.back();
-    storedId = id;
+    m_ids.emplace_back(id);
 
     // Update last used position
     setEndPos(rawSize());