fix: Ensure app discover section is returned as list

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

apps/settings/lib/Controller/AppSettingsController.php

@@ -105,7 +105,7 @@ public function viewApps(): TemplateResponse {
 	#[NoCSRFRequired]
 	public function getAppDiscoverJSON(): JSONResponse {
 		$data = $this->discoverFetcher->get(true);
-		return new JSONResponse($data);
+		return new JSONResponse(array_values($data));
 	}
 
 	/**