Remove BaseSettings & merge ConcurrentSettings (#4775)

src/widgets/BaseWindow.cpp

@@ -710,7 +710,7 @@ void BaseWindow::updateScale()
     auto scale =
         this->nativeScale_ * (this->flags_.has(DisableCustomScaling)
                                   ? 1
-                                  : getABSettings()->getClampedUiScale());
+                                  : getSettings()->getClampedUiScale());
 
     this->setScale(scale);