CMakePM: Fix removing cmake tools

The id might be destroyed with its parent before trying to
reference it again and put it into the list.

Change-Id: Ic7bb053293b24f0f0109a1c6479f73b7cbec2dc0
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/cmakesettingspage.cpp

@@ -343,8 +343,8 @@ void CMakeToolItemModel::removeCMakeTool(const Utils::Id &id)
     CMakeToolTreeItem *treeItem = cmakeToolItem(id);
     QTC_ASSERT(treeItem, return);
 
-    destroyItem(treeItem);
     m_removedItems.append(id);
+    destroyItem(treeItem);
 }
 
 void CMakeToolItemModel::apply()