QmlDesigner: Remove call to SubComponentManager::update

It has no model attached so is doing nothing and called later again.

Change-Id: Ide36ba5640ff18e29d5be2ad5911ed448f37c92b
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

src/plugins/qmldesigner/components/integration/designdocument.cpp

@@ -244,8 +244,6 @@ void DesignDocument::loadDocument(QPlainTextEdit *edit)
 
     updateFileName(QString(), fileName());
 
-    m_subComponentManager->update(QUrl::fromLocalFile(fileName()), currentModel()->imports());
-
     m_documentLoaded = true;
 }