fix: move overflow: hidden to address mixed-decls warning (#549)

https://sass-lang.com/documentation/breaking-changes/mixed-decls/

Author: brian-smith-tcril

src/studio-header/StudioHeader.scss

@@ -29,15 +29,15 @@ $white: #FFFFFF;
   }
 
   .course-title-lockup {
+    overflow: hidden;
+
     @media only screen and (min-width: 769px) {
       padding: .5rem;
       padding-right: $spacer;
       border-right: 1px solid #E5E5E5;
       width: 70%;
     }
 
-    overflow: hidden;
-  
     span {
       color: #333333;
       white-space: nowrap;