Core: Remove QObject inheritance of IOptionsPageProvider

This was not really used.

Change-Id: I86049697d211d88827a9633b367d2121fa8d1f1c
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/dialogs/ioptionspage.cpp

@@ -277,8 +277,7 @@ bool IOptionsPage::matches(const QRegularExpression &regexp) const
 
 static QList<IOptionsPageProvider *> g_optionsPagesProviders;
 
-IOptionsPageProvider::IOptionsPageProvider(QObject *parent)
-    : QObject(parent)
+IOptionsPageProvider::IOptionsPageProvider()
 {
     g_optionsPagesProviders.append(this);
 }