Format code with gofumpt (#724)

This commit fixes the style issues introduced in b81470d according to the output
from gofumpt.

Details: https://deepsource.io/gh/anacrolix/torrent/transform/ccafd976-fc9a-4c8a-bbfe-bc36426e79cb/

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

bencode/decode_test.go

@@ -213,7 +213,6 @@ func decodeHugeString(t *testing.T, strLen int64, header, tail string, v interfa
 	d := NewDecoder(r)
 	d.MaxStrLen = maxStrLen
 	return d.Decode(v)
-
 }
 
 // Ensure that bencode strings in various places obey the Decoder.MaxStrLen field.

webrtc.go

@@ -60,9 +60,11 @@ func (me webrtcNetConn) RemoteAddr() net.Addr {
 func (w webrtcNetConn) SetDeadline(t time.Time) error {
 	return nil
 }
+
 func (w webrtcNetConn) SetReadDeadline(t time.Time) error {
 	return nil
 }
+
 func (w webrtcNetConn) SetWriteDeadline(t time.Time) error {
 	return nil
 }