EDELIVERY-11590 SMP UI Improvements Breadcrumb

Fix disabling the breadcrumbs when it contains 4 items.
Fix displaying the disabled items in the breadcrumbs when using themes other than the default one.

smp-angular/src/app/window/breadcrumb/breadcrumb-item/breadcrumb-item.component.scss

@@ -8,6 +8,10 @@
   padding: 0 .4em;
 }
 
+.smp-breadcrumb-item.smp-disabled * {
+  background-color: gray !important;
+}
+
 .smp-breadcrumb-content {
   z-index: 1;
   // user parent

smp-angular/src/app/window/sidenav/navigation-model.service.ts

@@ -146,7 +146,8 @@ export class NavigationService extends MatTreeNestedDataSource<NavigationNode> {
 
         // mark the parent of the first leaf in a menu as non-clickable
         let parent = this.findParent(selectedPath[leafIndex]);
-        if (parent && parent.children && parent.children[0] == selectedPath[leafIndex]) {
+        let grandParent = this.findParent(parent);
+        if (parent && parent.children && parent.children[0] == selectedPath[leafIndex] && grandParent == this.rootNode) {
           parent.clickable = false;
         }