Removed old Connect css class

Author: Miguel Balparda

app/code/Magento/Marketplace/view/adminhtml/templates/index.phtml

@@ -46,7 +46,7 @@
         </div>
         <div class="col-m-3">
             <img
-                class="magento-connect-logo"
+                class="magento-marketplace-logo"
                 src="<?php /* @escapeNotVerified */ echo $block
                     ->getViewFileUrl('Magento_Marketplace::partners/images/magento-marketplace.svg');
                 ?>"

app/design/adminhtml/Magento/backend/Magento_Marketplace/web/css/source/_module.less

@@ -61,7 +61,7 @@
 }
 
 .partners-footer {
-    .magento-connect-logo {
+    .magento-marketplace-logo {
         float: right;
         margin-bottom: 1px;
     }