opeyUserLogin can create duplicate toggle buttons [#3570385]

Problem/Motivation

The password toggle button was getting duplicated when password_policy and password_policy_extras modules were enabled. The issue has been fixed by updating the JavaScript to use Drupal's once API.

Steps to reproduce

Install password_policy.
Go to the user for for an authenticated user.
Type a password.
Observe the "Show" field is duplicated lots of times.

Proposed resolution

Use once.

Remaining tasks

User interface changes

API changes

Data model changes

Issue fork openy_carnation-3570385

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3570385-opeyuserlogin-can-create changes, plain diff MR !120
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