Revert "Logo update - father's day (#1213)"

This reverts commit e22a49e.

Author: ajefts

assets/css/layout/header.scss

@@ -472,13 +472,12 @@
 
     // Topcoder logo
     .logo-link {
-      background: url(../../images/topcoder-logo-dads.png);
+      background: url(../../images/logo_topcoder.svg);
       width: 156px;
       height: 54px;
       margin: 0;
       background-repeat: no-repeat;
       background-position: 50% 50%;
-      background-size: contain;
       float: left;
       position: static;
     }