Python: Use specialized document to check for pylsp

Change-Id: I9ea13df7fc04a4fe35d901da179b9c0ebaf57bb6
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/python/pythonplugin.cpp

@@ -111,9 +111,6 @@ void PythonPlugin::extensionsInitialized()
     Core::FileIconProvider::registerIconOverlayForSuffix(imageFile, "py");
 
     TaskHub::addCategory(PythonErrorTaskCategory, "Python", true);
-
-    connect(Core::EditorManager::instance(), &Core::EditorManager::documentOpened,
-            this, &PyLSConfigureAssistant::documentOpened);
 }
 
 } // namespace Internal