Add fix for continuation on playlists smaller than 100 videos

src/invidious/playlists.cr

@@ -65,6 +65,11 @@ def fetch_playlist_videos(plid, page, video_count, continuation = nil)
       nodeset = document.xpath_nodes(%q(.//tr[contains(@class, "pl-video")]))
 
       videos = extract_playlist(plid, nodeset, 0)
+      if continuation
+        until videos[0].id == continuation
+          videos.shift
+        end
+      end
     end
   end