FIX: change error details to detail due to tank upgrade

src/components/FileManager.vue

@@ -1026,9 +1026,9 @@ export default {
         // if there was a 409 Conflict response it means, that this file is
         // still used in one or more playlists.
         if (error.response.status === 409) {
-          let pls = error.response.data.details.playlists.length
+          let pls = error.response.data.detail.playlists.length
           let msg = 'Cannot delete file. Still used in ' + pls + ' playlists:\n\n'
-          for (let pl of error.response.data.details.playlists) {
+          for (let pl of error.response.data.detail.playlists) {
             msg += 'ID: ' + pl.id
             if (pl.description) {
               msg += ' (' + pl.description + ')'