gtk3: Fix nautilus path bar button border radius

Fixes path bar button border radius when button is only child

#97

Author: drakkar1969

common/gtk-3.0/3.24/sass/_applications.scss

@@ -104,14 +104,14 @@ terminal-window,
 
     border-width: 0;
 
-    &:only-child {
-      border-radius: 3px 0px 0px 3px;
-    }
-
     &:last-child {
       border-radius: 0;
       border-right-width: 1px;
     }
+
+    &:only-child {
+      border-radius: 3px 0px 0px 3px;
+    }
   }
 
   @include pathbar_linking_rules($sep_color:$header_button_border);