Revert "TUN-6384: Correct duplicate connection error to fetch new IP first"

This reverts commit 76add5ca77.

supervisor/tunnel.go

@@ -141,11 +141,10 @@ type DefaultAddrFallback struct {
 func (f DefaultAddrFallback) ShouldGetNewAddress(err error) (needsNewAddress bool, isConnectivityError bool) {
 	switch err.(type) {
 	case nil: // maintain current IP address
-	// DupConnRegisterTunnelError should indicate to get a new address immediately
-	case connection.DupConnRegisterTunnelError:
-		return true, false
-	// Try the next address if it was a quic.IdleTimeoutError
+	// Try the next address if it was a quic.IdleTimeoutError or
+	// dupConnRegisterTunnelError
 	case *quic.IdleTimeoutError,
+		connection.DupConnRegisterTunnelError,
 		edgediscovery.DialError,
 		*connection.EdgeQuicDialError:
 		// Wait for two failures before falling back to a new address