New refreshed patch 34519.2
Included heading changes for /wp-admin/maint/repair.php and /wp-admin/upgrade.php and readme.html
because they also use install.css too and have only the logo in the H1.
For readme.html:
I suggest to keep this as is for now:
<h1 id="logo">
<a href="https://wordpress.org/"><img alt="WordPress" src="wp-admin/images/wordpress-logo.png"></a>
<br> Version 4.4
</h1>
And figure out for a later release how to remove the link out of the h1 without ruining the install screens css.
Now in the heading list, this reads as "WordPress Version 4.4" and that's ok.