fixed ACP background image on subfolder installs

public/less/admin/admin.less

@@ -73,7 +73,7 @@
 		padding-top: 50px;
 		top: 0px;
 		left: 0px;
-		background: url('../images/admin/connect-tile.png');
+		background: url(data:image/png;base64,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);
 		z-index: 1;
 		overflow-y: auto;