make palette icons have a light border not a shadow

gives it a nicer flat look
diff --git a/ui-modules/blueprint-composer/app/components/catalog-selector/catalog-selector.less b/ui-modules/blueprint-composer/app/components/catalog-selector/catalog-selector.less
index c7aae95..69e8835 100644
--- a/ui-modules/blueprint-composer/app/components/catalog-selector/catalog-selector.less
+++ b/ui-modules/blueprint-composer/app/components/catalog-selector/catalog-selector.less
@@ -84,7 +84,7 @@
     transition: all @duration-item ease;
     position: relative;
     background: white; //useful when dragging
-    box-shadow: 0 0 rgba(0, 0, 0, 0.1), 0 0 2px 1px rgba(0, 0, 0, 0.2);
+    border: 1px solid #ccc;  // same colour as input controls, works well with rgb(0,0,0,N) used for shadow  
     &:hover {
       box-shadow: 0 0 rgba(0, 0, 0, 0.2), 0 0 4px 1px rgba(0, 0, 0, 0.5);
       margin: -2px;