postmarketos-initramfs: run_hooks: hide ls error (MR 5636)

We need to use ls to check if the hooks dir contains any hooks
(otherwise the wildcard doesn't work). But ls prints an error if the dir
is missing or empty. Hide the error to not pollute the log.

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>

main/postmarketos-initramfs/init_functions.sh

@@ -681,7 +681,7 @@ mount_root_partition() {
 run_hooks() {
 	scriptsdir="$1"
 
-	if [ -z "$(ls -A "$scriptsdir")" ]; then
+	if [ -z "$(ls -A "$scriptsdir" 2>/dev/null)" ]; then
 		return
 	fi