_scripts: remove an errant set-x

This removes a noisy set-x that was mistakenly included in
f982fd5.

Signed-off-by: Jonathan Matthews <github@hello.jonathanmatthews.com>
Change-Id: I181e67ccd176c1d2acc3cf3055ad4a238e54e2be
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cuelang.org/+/1177296
TryBot-Result: CUEcueckoo <cueckoo@gmail.com>
Reviewed-by: Paul Jolly <paul@myitcv.io>

_scripts/contentNewDocument.bash

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-set -xeuo pipefail
+set -euo pipefail
 
 # Invoke the script with no arguments to see the usage text.
 function _usage(){