CMakePM: Fix order of initialization

CMakeToolManager instance must be created first to avoid connects
to a nullptr.

Change-Id: If8738a26d58c80ffc9a63193240895f1bc9a87ae
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cmakeprojectmanager/cmaketoolmanager.cpp

@@ -57,7 +57,7 @@ static CMakeToolManagerPrivate *d = nullptr;
 
 CMakeToolManager *CMakeToolManager::m_instance = nullptr;
 
-CMakeToolManager::CMakeToolManager(QObject *parent) : QObject(parent)
+CMakeToolManager::CMakeToolManager()
 {
     QTC_ASSERT(!m_instance, return);
     m_instance = this;