fixing nginx wildcard includes with relative path

acme.sh

@@ -3059,10 +3059,15 @@ _setNginx() {
     _start_f="$NGINX_CONF"
   fi
   _debug "Start detect nginx conf for $_d from:$_start_f"
+  if ! pushd $(dirname $_start_f) > /dev/null; then
+    _err "Can not chdir to nginx conf folder $(dirname $_start_f)"
+    return 1
+  fi
   if ! _checkConf "$_d" "$_start_f"; then
     _err "Can not find conf file for domain $d"
     return 1
   fi
+  popd > /dev/null
   _info "Found conf file: $FOUND_REAL_NGINX_CONF"
 
   _ln=$FOUND_REAL_NGINX_CONF_LN