narrow: remove hack to write narrowspec to shared .hg directory
AFAIK, we no longer need it since the narrowspec file was move to the
store directory in
576eef1ab43d, "narrow: move .hg/narrowspec to
.hg/store/narrowspec."
@echo off
powershell -NoProfile -ExecutionPolicy unrestricted -Command "& '%~dp0\editmergeps.ps1' %*"