Core: Make PagedSettings autoapply by default in the base

Instead of relying (and forgetting...) it in all derived clases.

Change-Id: I5d1dea0ace420d464c39c192278ae6e5db01de90
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/cmakeprojectmanager/cmakespecificsettings.cpp

@@ -31,7 +31,6 @@ CMakeSpecificSettings::CMakeSpecificSettings()
     setDisplayCategory("CMake");
     setCategory(Constants::Settings::CATEGORY);
     setCategoryIconPath(Constants::Icons::SETTINGS_CATEGORY);
-    setSettings(this);
 
     setLayouter([this](QWidget *widget) {
         using namespace Layouting;