CMakeProjectManager: Fix connection to save tools settings

Amends 4e23f2a6eb.

This should actually not be needed in the end, and rather steered
by the auto registration and settings page apply.

Change-Id: I7f94e776fec4394f539e32e5c527c367251654a8
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/cmakeprojectmanager/cmakeprojectplugin.cpp

@@ -43,7 +43,8 @@ namespace CMakeProjectManager::Internal {
 class CMakeProjectPluginPrivate : public QObject
 {
 public:
-    CMakeToolManager cmakeToolManager; // have that before the first CMakeKitAspect
+    // This can't be stand-alone yet as it registers in the plugin object pool
+    CMakeToolManager cmakeToolManager;
 
     ParameterAction buildTargetContextAction{
         Tr::tr("Build"),