refactor: move style to css to avoid overriding on dnd

When testing new feature "hybrid" with dnd, the style for no background was being ignored. Moving it to the stylesheet makes it not visible even when doing dnd as expected.

Author: paodb

src/main/resources/META-INF/frontend/fc-orgchart.js

@@ -118,7 +118,6 @@ class FCOrgChart extends PolymerElement {
         }
 
   		$("div.orgchart").prev().closest("div").attr("id", "chart-container");
-  		this.querySelector(".orgchart").style.setProperty("background-image","none");
 
   		// workaround  for direction b2t with node template  without content div
   		var direction = state.chartDirection;

src/main/resources/META-INF/resources/frontend/fc-orgchart-styles.css

@@ -26,3 +26,7 @@
 .orgchart .node .content {
 	overflow: hidden;
 }
+
+.orgchart {
+	background-image: none;
+}