test: disable simple/test-dgram-send-error

It's not a good citizen, it spams random IP addresses with UDP packets.

Fixes #4730.

diff --git a/test/simple/test-dgram-send-error.js b/test/disabled/test-dgram-send-error.js
similarity index 100%
rename from test/simple/test-dgram-send-error.js
rename to test/disabled/test-dgram-send-error.js