[FL-3608] Fix iButton crash on missing file (#3210)

Co-authored-by: あく <alleteam@gmail.com>

applications/main/ibutton/scenes/ibutton_scene_add_value.c

@@ -43,7 +43,7 @@ bool ibutton_scene_add_value_on_event(void* context, SceneManagerEvent event) {
     } else if(event.type == SceneManagerEventTypeBack) {
         // User cancelled editing, reload the key from storage
         if(scene_manager_has_previous_scene(scene_manager, iButtonSceneSavedKeyMenu)) {
-            if(!ibutton_load_key(ibutton)) {
+            if(!ibutton_load_key(ibutton, true)) {
                 consumed = scene_manager_search_and_switch_to_previous_scene(
                     scene_manager, iButtonSceneStart);
             }

applications/main/ibutton/scenes/ibutton_scene_rpc.c

@@ -26,7 +26,7 @@ bool ibutton_scene_rpc_on_event(void* context, SceneManagerEvent event) {
         if(event.event == iButtonCustomEventRpcLoadFile) {
             bool result = false;
 
-            if(ibutton_load_key(ibutton)) {
+            if(ibutton_load_key(ibutton, false)) {
                 popup_set_text(popup, ibutton->key_name, 82, 32, AlignCenter, AlignTop);
                 view_dispatcher_switch_to_view(ibutton->view_dispatcher, iButtonViewPopup);