Initial logic to switch the burger button icon when signing in/out

java/com.sap.sailing.gwt.ui/images/mobile/navigation-icon-signedin.svg

@@ -0,0 +1 @@
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java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/home/mobile/partials/header/Header.java

@@ -89,6 +89,7 @@ public class Header extends Composite {
         eventBus.addHandler(UserManagementContextEvent.TYPE, new UserManagementContextEvent.Handler() {
             @Override
             public void onUserChangeEvent(UserManagementContextEvent event) {
+                dropdownTriggerUi.setSrc(event.getCtx().isLoggedIn() ? "images/mobile/navigation-icon-signedin.svg" : "images/mobile/navigation-icon.svg");
                 if(event.getCtx().isLoggedIn()) {
                     signInNavigationItem.getElement().getStyle().setDisplay(Display.NONE);
                     userDetailsNavigationItem.getElement().getStyle().clearDisplay();