Terminal: Use PageSettings for settings

The DropSupport is disabled for now, plan is to have a DropArea
LayoutItem later and use that.

Change-Id: I7fd1e55ad0c053f0357bb53a7cc20e9da8a933a7
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/terminal/terminalpane.cpp

@@ -151,7 +151,6 @@ TerminalPane::TerminalPane(QObject *parent)
 
     connect(m_escSettingButton, &QToolButton::toggled, this, [this] {
         TerminalSettings::instance().sendEscapeToTerminal.setValue(m_escSettingButton->isChecked());
-        TerminalSettings::instance().apply();
         TerminalSettings::instance().writeSettings(Core::ICore::settings());
     });