maintenance-mode background not shown

Hi. Just reporting an issue.

In the latest update of the plugin, 7.0.3, the maintenance-mode background image is not being shown. The page’s HTML source shows the following:

<style>
body {
    ;
    background-size: cover;
    background-position: center center;
}
</style>

Comparing that with the HTML output from the previous version (7.0.2.2):

<style>
body {
    background-image: url("data:image/svg+xml,%3csvg [...] ;
    background-size: cover;
    background-position: center center;
}
</style>