timers: use start instead of stop + start

Instead of calling stop + start from the refresh method
of Timeout, instead just call start as libuv already
calls stop if necessary.

PR-URL: https://github.com/nodejs/node/pull/18486


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>