iOS: Enable Storyboard launch screen by default

LaunchImages are deprecated, and Storyboard is supported on all currently
supported iOS versions, so this should be the default.

LaunchImages support was removed in 4.3 with godotengine#86312.

(cherry picked from commit 91c5d1e)

platform/ios/export/export_plugin.cpp

@@ -227,7 +227,7 @@ void EditorExportPlatformIOS::get_export_options(List<ExportOption> *r_options)
 			r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, icon_infos[i].preset_key, PROPERTY_HINT_FILE, "*.png,*.jpg,*.jpeg"), ""));
 		}
 	}
-	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "storyboard/use_launch_screen_storyboard"), false, true));
+	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "storyboard/use_launch_screen_storyboard"), true, true));
 	r_options->push_back(ExportOption(PropertyInfo(Variant::INT, "storyboard/image_scale_mode", PROPERTY_HINT_ENUM, "Same as Logo,Center,Scale to Fit,Scale to Fill,Scale"), 0));
 	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "storyboard/custom_image@2x", PROPERTY_HINT_FILE, "*.png,*.jpg,*.jpeg"), ""));
 	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "storyboard/custom_image@3x", PROPERTY_HINT_FILE, "*.png,*.jpg,*.jpeg"), ""));