__netbox: avoid useless generated code-remote

Because `set -e` got printed all the time, the type __netbox always had
some generated code for the remote side. This line was removed because
this is already done by cdist when executing the code-remote script.

Rather, the exit-on-error option was set to some scirpts (two ..).

type/__netbox/gencode-remote

@@ -1,6 +1,4 @@
-#!/bin/sh
-
-echo "set -e"
+#!/bin/sh -e
 
 old_version="$(cat "$__object/explorer/version")"
 VERSION=$(cat "$__object/parameter/version")

type/__netbox/manifest

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/sh -e
 
 os=$(cat "$__global/explorer/os")