Add fix for channel job

src/invidious.cr

@@ -83,9 +83,13 @@ crawl_threads.times do
   end
 end
 
+total_channels = PG_DB.query_one("SELECT count(*) FROM channels", as: Int64)
 channel_threads.times do |i|
+  limit = total_channels / channel_threads
+  offset = limit.not_nil! * i
+
   spawn do
-    refresh_channels(PG_DB)
+    refresh_channels(PG_DB, limit, offset)
   end
 end