Fix failing test due to an invalid path

Author: mauriciocolli

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/YoutubeSubscriptionExtractorTest.java

@@ -33,7 +33,9 @@ public static void setupClass() {
 
     @Test
     public void testFromInputStream() throws Exception {
-        File testFile = new File("src/test/resources/youtube_export_test.xml");
+        File testFile = new File("extractor/src/test/resources/youtube_export_test.xml");
+        if (!testFile.exists()) testFile = new File("src/test/resources/youtube_export_test.xml");
+
         List<SubscriptionItem> subscriptionItems = subscriptionExtractor.fromInputStream(new FileInputStream(testFile));
         assertTrue("List doesn't have exactly 8 items (had " + subscriptionItems.size() + ")", subscriptionItems.size() == 8);