This specific option is not present in OJS3. You can instead use CSS to do this out of the box.
Consider, for example, a stylesheet with a declaration of:
h1.pkp_site_title {
text-indent: -999px;
background-image: url(/ojs/public/site/sitelogo.jpg);
background-repeat: no-repeat;
}
Alternately, you can use a theme plugin such as the bootstrap3 theme, which will require a lot more work, but allow substantial flexibility:
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