Remove unused QObject parent arguments on options pages

In the new plugin setup scheme they are data members of the
plugin pimpl and never use the parent.

Change-Id: I28fe150393e8159064dcfbd113ce0320af50fd58
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/qmljseditor/qmljseditingsettingspage.h

@@ -82,7 +82,7 @@ class QmlJsEditingSettignsPageWidget : public QWidget
     Q_OBJECT
 
 public:
-    explicit QmlJsEditingSettignsPageWidget(QWidget *parent = nullptr);
+    QmlJsEditingSettignsPageWidget();
 
     QmlJsEditingSettings settings() const;
     void setSettings(const QmlJsEditingSettings &);