Correcting max-width logic

Author: adamjgrant

lib-core/sass/core/components/_navbar.sass

@@ -23,7 +23,7 @@
 
     > li
       ul[role=button], > [role=button], &.navbar-title button[role="button"]
-        @media screen and (max-width: #{$breakpoint+1px})
+        @media screen and (max-width: #{$breakpoint-1px})
           margin:
             left: 0
             right: 0