fix: pop updates from front of queues instead of back

This way if peers are being announced faster than can be upserted, the insert order will be maintained. Was supposed to be like this since the beginning, not sure how it got switched around.

src/scheduler/announce_update.rs

@@ -74,7 +74,7 @@ impl Queue {
     pub fn take_batch(&mut self) -> Queue {
         let len = self.len();
 
-        Queue(self.split_off(len - min(Queue::announce_limit(), len)))
+        Queue(self.drain(0..min(Queue::announce_limit(), len)).collect())
     }
 
     /// Merge a announce update batch into this announce update batch

src/scheduler/history_update.rs

@@ -105,7 +105,7 @@ impl Queue {
     pub fn take_batch(&mut self) -> Queue {
         let len = self.len();
 
-        Queue(self.split_off(len - min(Queue::history_limit(), len)))
+        Queue(self.drain(0..min(Queue::history_limit(), len)).collect())
     }
 
     /// Merge a history update batch into this history update batch

src/scheduler/peer_update.rs

@@ -98,7 +98,7 @@ impl Queue {
     pub fn take_batch(&mut self) -> Queue {
         let len = self.len();
 
-        Queue(self.split_off(len - min(Queue::peer_limit(), len)))
+        Queue(self.drain(0..min(Queue::peer_limit(), len)).collect())
     }
 
     /// Merge a peer update batch into this peer update batch

src/scheduler/torrent_update.rs

@@ -68,7 +68,7 @@ impl Queue {
     pub fn take_batch(&mut self) -> Queue {
         let len = self.len();
 
-        Queue(self.split_off(len - min(Queue::torrent_limit(), len)))
+        Queue(self.drain(0..min(Queue::torrent_limit(), len)).collect())
     }
 
     /// Merge a torrent update batch into this torrent update batch

src/scheduler/user_update.rs

@@ -55,7 +55,7 @@ impl Queue {
     pub fn take_batch(&mut self) -> Queue {
         let len = self.len();
 
-        Queue(self.split_off(len - min(Queue::user_limit(), len)))
+        Queue(self.drain(0..min(Queue::user_limit(), len)).collect())
     }
 
     /// Merge a torrent update batch into this torrent update batch