name audioSnippetDuration property explicitly

Signed-off-by: Sebastian Schüpbach <sebastian.schuepbach@unibas.ch>

src/main/scala/ch/memobase/App.scala

@@ -33,6 +33,7 @@ object App extends scala.App with Logging {
     "audioSinkDir",
     "imageSinkDir",
     "videoSinkDir",
+    "audioSnippetDuration",
     "internalBaseUrl",
     "externalBaseUrl",
     "fedoraUser",

src/test/scala/ch/memobase/DisseminationCopyHandlerTest.scala

@@ -70,6 +70,7 @@ class DisseminationCopyHandlerTest extends AnyFunSuite with BeforeAndAfter {
     val testSnippetFile = Files.createFile(Paths.get(f.resPath, "test-intro.mp3"))
     f.fileHandler.deleteAudioCopy("test")
     assert(!testFile.toFile.exists())
+    assert(!testSnippetFile.toFile.exists())
   }
 
   /**