conn: inch BatchSize toward being non-dynamic

There's not really a use at the moment for making this configurable, and
once bind_windows.go behaves like bind_std.go, we'll be able to use
constants everywhere. So begin that simplification now.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

device/queueconstants_android.go

@@ -10,7 +10,7 @@ import "golang.zx2c4.com/wireguard/conn"
 /* Reduce memory consumption for Android */
 
 const (
-	QueueStagedSize            = conn.DefaultBatchSize
+	QueueStagedSize            = conn.IdealBatchSize
 	QueueOutboundSize          = 1024
 	QueueInboundSize           = 1024
 	QueueHandshakeSize         = 1024

device/queueconstants_default.go

@@ -10,7 +10,7 @@ package device
 import "golang.zx2c4.com/wireguard/conn"
 
 const (
-	QueueStagedSize            = conn.DefaultBatchSize
+	QueueStagedSize            = conn.IdealBatchSize
 	QueueOutboundSize          = 1024
 	QueueInboundSize           = 1024
 	QueueHandshakeSize         = 1024