You can use a .htaccess url rewrite to force the access via https or you could edit your login.tpl to hard code the https:// into the form action.

You need to add the code mentioned below in your .htaccess file

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RewriteEngine On
RewriteCond %{SERVER_PORT} !^443$
RewriteRule .* https://%{SERVER_NAME}%{REQUEST_URI} [R,L]

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