Update metadata test for ConfigSource 'default' variant

The test loads an app without a --config flag and without a cache entry,
so the source is now correctly reported as 'default' instead of 'cached'.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ryancbahan

packages/app/src/cli/models/app/loader.test.ts

@@ -2618,7 +2618,7 @@ describe('load', () => {
       cmd_app_all_configs_clients: JSON.stringify({'shopify.app.toml': '1234567890'}),
       cmd_app_linked_config_name: 'shopify.app.toml',
       cmd_app_linked_config_git_tracked: true,
-      cmd_app_linked_config_source: 'cached',
+      cmd_app_linked_config_source: 'default',
       cmd_app_warning_api_key_deprecation_displayed: false,
       app_extensions_any: false,
       app_extensions_breakdown: {},