gluon-lock-password: convert to invariant script and remove legacy script

package/gluon-lock-password/files/lib/gluon/upgrade/lock-password/initial/010-lock-password

-#!/bin/sh
-
-passwd -l root

package/gluon-legacy/files/lib/gluon/upgrade/lock-password/legacy/010-lock-password → package/gluon-lock-password/files/lib/gluon/upgrade/lock-password/invariant/010-lock-password

 #!/bin/sh
 
-
 has_root_pwd() {
-	local pwd=$([ -f "$1" ] && cat "$1")
+	local pwd
+
+	pwd=$([ -f "$1" ] && cat "$1")
 	pwd="${pwd#*root:}"
 	pwd="${pwd%%:*}"
 
-	test -n "${pwd#[\!x]}"
+	test -n "${pwd}"
 }
 
-
-has_root_pwd /etc/passwd || has_root_pwd /etc/shadow || passwd -l root
+has_root_pwd /etc/shadow || passwd -l root