Fix dataChanged emitted when PIDs are loaded

When our cgroup PIDs are changed, potentially all columns are changed.
The existing dataChanged only handled the first column


(cherry picked from commit 63710a48)

processcore/cgroup_data_model.cpp

@@ -419,7 +419,7 @@ void CGroupDataModel::update(CGroup *node)
     // This may trigger some dataChanged
     node->requestPids(this, [this, node]() {
         auto row = d->m_cGroups.indexOf(node);
-        Q_EMIT dataChanged(index(row, 0, QModelIndex()), index(row, 0, QModelIndex()));
+        Q_EMIT dataChanged(index(row, 0, QModelIndex()), index(row, columnCount()-1, QModelIndex()));
     });
 
     const auto entries = dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot);