[FL-2811] Fix PVS-Studio warnings (#2142)

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

applications/services/gui/modules/variable_item_list.c

@@ -188,8 +188,8 @@ void variable_item_list_process_up(VariableItemList* variable_item_list) {
             uint8_t items_on_screen = 4;
             if(model->position > 0) {
                 model->position--;
-                if(((model->position - model->window_position) < 1) &&
-                   model->window_position > 0) {
+
+                if((model->position == model->window_position) && (model->window_position > 0)) {
                     model->window_position--;
                 }
             } else {