Delete rwfiletest.bin on exit SDcard benchmark (#2415)

* Update storage_settings_scene_benchmark.c: delete rwfiletest.bin on exit SDcard brencmark
* Settings: cleanup SD Benchmark temp file only if test successful


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

applications/settings/storage_settings/scenes/storage_settings_scene_benchmark.c

@@ -103,6 +103,9 @@ static void storage_settings_scene_benchmark(StorageSettings* app) {
             break;
 
         furi_string_cat_printf(app->text_string, "R %luK", bench_r_speed[i]);
+
+        storage_common_remove(app->fs_api, BENCH_FILE);
+
         dialog_ex_set_text(
             dialog_ex, furi_string_get_cstr(app->text_string), 0, 32, AlignLeft, AlignCenter);
     }