Fix channel url for channel items

src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeChannelExtractor.java

@@ -222,6 +222,7 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
         collector.reset();
 
         final String uploaderName = getName();
+        final String uploaderUrl = getCleanUrl();
         for (final Element li : element.children()) {
             if (li.select("div[class=\"feed-item-dismissable\"]").first() != null) {
                 collector.commit(new YoutubeStreamInfoItemExtractor(li) {
@@ -252,6 +253,11 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
                         return uploaderName;
                     }
 
+                    @Override
+                    public String getUploaderUrl() throws ParsingException {
+                        return uploaderUrl;
+                    }
+
                     @Override
                     public String getThumbnailUrl() throws ParsingException {
                         try {