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/android/androidsettingspage.cpp

@@ -38,8 +38,7 @@ using namespace ProjectExplorer;
 namespace Android {
 namespace Internal {
 
-AndroidSettingsPage::AndroidSettingsPage(QObject *parent)
-    : Core::IOptionsPage(parent)
+AndroidSettingsPage::AndroidSettingsPage()
 {
     setId(Constants::ANDROID_SETTINGS_ID);
     setDisplayName(tr("Android"));

src/plugins/android/androidsettingspage.h

@@ -39,7 +39,7 @@ class AndroidSettingsPage : public Core::IOptionsPage
     Q_OBJECT
 
 public:
-    explicit AndroidSettingsPage(QObject *parent = nullptr);
+    AndroidSettingsPage();
 
     QWidget *widget() override;
     void apply() override;