Fix toArray method in Doc class

- remove dead variables
- fix check for mime type

Classes/Common/Doc.php

@@ -1366,9 +1366,6 @@ public function toArray($uriBuilder, array $config = [])
  'minPage' => $minPage
  ]
  ];
- $extConf = GeneralUtility::makeInstance(ExtensionConfiguration::class)->get(self::$extKey);
- $fileGrpsImages = array_reverse(GeneralUtility::trimExplode(',', $extConf['fileGrpImages']));
- $fileGrpsFulltext = GeneralUtility::trimExplode(',', $extConf['fileGrpFulltext']);
 
  $allFiles = $this->getAllFiles();
 
@@ -1392,8 +1389,8 @@ public function toArray($uriBuilder, array $config = [])
  }
 
  // Only deliver static images via the internal PageViewProxy.
- // (For IIP and IIIF, the viewer needs to build and access a separate metadata URL, see `getMetdadataURL`.)
- if (in_array($fileGrp, $proxyFileGroups) && !in_array($mimetype, self::$nonProxyMimeTypes)) {
+ // (For IIP and IIIF, the viewer needs to build and access a separate metadata URL, see `getMetadataURL`.)
+ if (in_array($fileGrp, $proxyFileGroups) && !in_array($file['mimetype'], self::$nonProxyMimeTypes)) {
  // Configure @action URL for form.
  $file['url'] = $uriBuilder
  ->reset()