Fix search result paging - due to the way as the InfoItemsSearchCollector are re-used,

the returned item list just grows, which cause that same videos are returned.

extractor/src/main/java/org/schabi/newpipe/extractor/services/media_ccc/extractors/MediaCCCSearchExtractor.java

@@ -48,6 +48,7 @@ public class MediaCCCSearchExtractor extends SearchExtractor {
     @Override
     public InfoItemsPage<InfoItem> getInitialPage() throws IOException, ExtractionException {
         InfoItemsSearchCollector searchItems = getInfoItemSearchCollector();
+        searchItems.reset();
 
         if(getLinkHandler().getContentFilters().contains(CONFERENCES)
                 || getLinkHandler().getContentFilters().contains(ALL)

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/SoundcloudSearchExtractor.java

@@ -76,6 +76,7 @@ public class SoundcloudSearchExtractor extends SearchExtractor {
 
     private InfoItemsCollector<InfoItem, InfoItemExtractor> collectItems(JsonArray searchCollection) {
         final InfoItemsSearchCollector collector = getInfoItemSearchCollector();
+        collector.reset();
 
         for (Object result : searchCollection) {
             if (!(result instanceof JsonObject)) continue;

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

@@ -106,6 +106,7 @@ public class YoutubeSearchExtractor extends SearchExtractor {
 
     private InfoItemsSearchCollector collectItems(Document doc) throws NothingFoundException  {
         InfoItemsSearchCollector collector = getInfoItemSearchCollector();
+        collector.reset();
 
         Element list = doc.select("ol[class=\"item-section\"]").first();
         final TimeAgoParser timeAgoParser = getTimeAgoParser();