fix(ui): fix keyboard shortcut for M link

closes pattern-lab/styleguidekit-assets-default#64
thanks @notacouch

Author: bmuenzenmeyer

packages/uikit-workshop/src/scripts/components/styleguide.js

@@ -133,7 +133,7 @@ import Mousetrap from 'mousetrap';
   });
 
   Mousetrap.bind('ctrl+shift+m', function(e) {
-    goLarge();
+    goMedium();
     return false;
   });