Password reset URLs are not properly encoded when rename WP Login setting is used

[paulgoodchild]

Reference: https://wordpress.org/support/topic/shield-security-hide-wordpress-login-page-breaks-link-in-password-reset-email/

Conditions:

• Shield's Rename WP Login setting is active
• A user requests a password reset using a username that contains spaces, (or any characters that would need to be URL encoded)

Result: Password reset link doesn't contain URL encoded username and so the resulting URL is broken.

This appears to be a fault, as far as we can see, with how WP's own add_query_args was working as it wasn't properly URL encoding query parameters.