CMakeTool: Fix disabling of "Autorun" property

Could no longer unset "Autorun" for CMake tools. Broke in
de6faa0f15

Change-Id: I0b6e9e64de591e1128ff0dabf4eedb40e1a3748c
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/cmakeprojectmanager/cmakesettingspage.cpp

@@ -287,6 +287,7 @@ void CMakeToolItemModel::updateCMakeTool(const Core::Id &id, const QString &disp
 
     treeItem->m_name = displayName;
     treeItem->m_executable = executable;
+    treeItem->m_isAutoRun = autoRun;
     treeItem->m_autoCreateBuildDirectory = autoCreate;
 
     treeItem->updateErrorFlags();