studio - open ended and annotations: added in component button icon assets and styling

cms/static/sass/_graphics.scss

@@ -259,7 +259,15 @@
 	width: 100px;
 	height: 60px;
 	margin-right: 5px;
-	background: url(../img/large-problem-icon.png) center no-repeat;
+	background: url(../img/large-openended-icon.png) center no-repeat;
+}
+
+.large-annotations-icon {
+	display: inline-block;
+	width: 100px;
+	height: 60px;
+	margin-right: 5px;
+	background: url(../img/large-annotations-icon.png) center no-repeat;
 }
 
 .large-advanced-icon {