Fix extraction of YouTube chapters (#531)

YouTube changed the name of the chapters in the JSON from engagement-panel-macro-markers to engagement-panel-macro-markers-description-chapters, so extracting chapters doesn't work.

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java

@@ -1079,8 +1079,10 @@ public class YoutubeStreamExtractor extends StreamExtractor {
 
             // Search for correct panel containing the data
             for (int i = 0; i < panels.size(); i++) {
-                if (panels.getObject(i).getObject("engagementPanelSectionListRenderer")
-                        .getString("panelIdentifier").equals("engagement-panel-macro-markers")) {
+                final String panelIdentifier = panels.getObject(i).getObject("engagementPanelSectionListRenderer")
+                        .getString("panelIdentifier");
+                if (panelIdentifier.equals("engagement-panel-macro-markers-description-chapters")
+                        || panelIdentifier.equals("engagement-panel-macro-markers")) {
                     segmentsArray = panels.getObject(i).getObject("engagementPanelSectionListRenderer")
                             .getObject("content").getObject("macroMarkersListRenderer").getArray("contents");
                     break;

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/stream/YoutubeStreamExtractorDefaultTest.java

@@ -259,7 +259,6 @@ public class YoutubeStreamExtractorDefaultTest {
 
         @Override public int expectedStreamSegmentsCount() { return 7; }
         @Test
-        @Ignore("TODO fix")
         public void testStreamSegment() throws Exception {
             final StreamSegment segment = extractor.getStreamSegments().get(1);
             assertEquals(164, segment.getStartTimeSeconds());