App Settings w/out radio settings, Settings UI cleanup (#1443)

* Make app settings more consistent

* Allow app settings to always work for custom settings

firmware/application/apps/ui_sonde.cpp

@@ -66,7 +66,7 @@ SondeView::SondeView(NavigationView& nav)
                   &button_see_qr,
                   &button_see_map});
 
-    if (!settings_.loaded())
+    if (!settings_.radio_loaded())
         field_frequency.set_value(initial_target_frequency);
 
     field_frequency.set_step(500);  // euquiq: was 10000, but we are using this for fine-tunning