Fixes typo in selection dropdown, causing it to appear incorrectly

Author: jlukic

src/modules/dropdown.less

@@ -381,7 +381,6 @@
 
 .ui.selection.dropdown,
 .ui.selection.dropdown .menu {
-  top: 100%;
   -webkit-transition: box-shadow 0.2s ease-out;
   -moz-transition: box-shadow 0.2s ease-out;
   -o-transition: box-shadow 0.2s ease-out;
@@ -390,6 +389,7 @@
 }
 
 .ui.selection.dropdown .menu {
+  top: 100%;
   max-height: 312px;
 
   overflow-x: hidden;