fix: psalm issues

Signed-off-by: Jana Peper <jana.peper@nextcloud.com>

Author: janepie

lib/Controller/AssistantApiController.php

@@ -389,7 +389,7 @@ public function getOutputFilePreview(int $ocpTaskId, int $fileId, ?int $x = 100,
 	 *
 	 * @param int $ocpTaskId The task ID
 	 * @param int $fileId The task output file ID
-	 * @return DataDownloadResponse<Http::STATUS_OK, string, array{}>|DataResponse<Http::STATUS_NOT_FOUND, '', array{}>
+	 * @return DataDownloadResponse<Http::STATUS_OK, truthy-string, array{}>|DataResponse<Http::STATUS_NOT_FOUND, '', array{}>
 	 *
 	 * 200: The file preview has been generated and is returned
 	 * 404: The output file is not found

tests/psalm-baseline.xml

@@ -5,12 +5,6 @@
 -->
 <files psalm-version="5.26.1@d747f6500b38ac4f7dfc5edbcae6e4b637d7add0">
   <file src="lib/Controller/AssistantApiController.php">
-    <InvalidReturnStatement>
-      <code><![CDATA[$response]]></code>
-    </InvalidReturnStatement>
-    <InvalidReturnType>
-      <code><![CDATA[DataDownloadResponse<Http::STATUS_OK, string, array{}>|DataResponse<Http::STATUS_NOT_FOUND, '', array{}>]]></code>
-    </InvalidReturnType>
     <LessSpecificReturnStatement>
       <code><![CDATA[new DataResponse(['tasks' => $serializedTasks])]]></code>
       <code><![CDATA[new DataResponse(['types' => $taskTypes])]]></code>