fix(Sass): datepicker & vertical-navigation were missing

Author: wywywywy

styles/_angular-patternfly.scss

@@ -13,4 +13,6 @@
 @import 'canvas';
 @import 'canvas-editor';
 @import 'pagination';
+@import 'datepicker';
 @import 'modal-overlay';
+@import 'vertical-navigation';